F5 + SRF + FE + HP at Buttonwillow Raceway Park

In EP Spec Lines, Ford Mustang (94-98), change weight as follows:
"2700 2550
*2768 2614
**2835 2678"
In EP Spec Lines, classify Ford Mustang (99-03) as follows:

A specification table follows in the original; it is not shown here.

Effective 3/1/2022 In EP, make changes to BMW spec lines as follows:
BMW Z3 2.5L - 59 58mm Flat Plate Intake Restrictor is required with both stock or alternate throttle body.
BMW 328i/is E36 (96-99) - 62mm Flat Plate Intake Restrictor is required.
BMW 328i/ci E46 (01-06) - 62mm Flat Plate Intake Restrictor is required.
BMW 325i/is E46 (01-06) - 60mm Flat Plate Intake Restrictor is required.
BMW 325i/is E36 (92-95) - 60mm Flat Plate Intake Restrictor is required.
BMW 325is M-Technic (1994) - 60mm Flat Plate Intake Restrictor is required.

In Production, GCR Section 9.1.5.B.5, change as follows:
"Any Improved Touring car meeting all the requirements of ITCS 9.1.3 may compete in the Production class in which the same
make, model and engine displacement car is classified. For Improved Touring cars competing in Production, the level of
preparation and modifications will be as determined by ITCS 9.1.3 and not by PCS 9.1.5, however any DOT approved tire as
defined by 9.3.45 is allowed."

In F500, GCR section 9.1.1.D.19, change as follows:
"All F500 cars competing in Majors Races and the Runoffs must have the AIM part #X47KPFSOLO2R0 data box mount installed
on the vehicle to provide the necessary mounting of the AIM Solo or Solo 2 data box."

In EP Spec Lines, Mazda RX-8 (04-11) (alternate), make the following changes to Carburetor. No. & Type:
"Renesis: Fuel Injection. 13B: d (1) Auto-type 2 bbl carb w/ 42mm choke(s) on a “dual-y” manifold, (1) 2 bbl fuel injected throttle
body w/ 42mm choke(s) on a “dual-y” manifold, or stock 13B fuel injection."

In Production, GCR Section 9.1.5.E.1.b.9, add the following:
"Stock/original idle control devices can be utilized in their original, unmodified location and condition, or completely removed
and any resulting openings blocked off. A mechanical stock/original idle control device can be replaced with an electronic
stock/original type of idle control device, with the original mechanical idle ports in the throttle body blocked off."
In Production, GCR Section 9.1.5.E.2.b.9, add the following:
"Stock/original idle control devices can be utilized in their original, unmodified location and condition, or completely removed
and any resulting openings blocked off. A mechanical stock/original idle control device can be replaced with an electronic
stock/original type of idle control device, with the original mechanical idle ports in the throttle body blocked off."

Effective 05/01/2022 In EP Spec Lines, Mazda MX-5 Global Cup (16-22), change as follows:
Weight (lbs): "see notes 2400"
Notes: "Car preparation is limited to what is permitted by the MX-5 Global Cup rules, and the car must meet all MX-5 Global Cup
rules except as otherwise indicated within this spec line. Competitors must have the current MX-5 Global Cup rules in their
possession and present them upon request. Sequential gearbox is allowed with +150lbs."

In EP Spec Lines, classify the BMW 128i (08-13) as follows:

A specification table follows in the original; it is not shown here.

In Production Category Specifications, GCR Section 9.1.5.E.9.a.12 change as follows:
"Open cars must remove convertible soft tops and all attaching bracketry and hardware. If the stock windshield is retained, OEM
and aftermarket hardtops are allowed. Aftermarket hardtops must retain OEM appearance in all exterior profiles, and carbon
fiber construction is not allowed. Any hardtop must be attached by positive fasteners."

In EP Spec Lines, Subaru BRZ (2013), change title changes:
"Subaru BRZ (13 - 20)"
In EP Spec Lines, Toyota Scion FR-S (2013), change title changes:
"Toyota 86 / Scion FR-S (13 - 20)"

In F500, GCR section 9.1.1.D.14.A, change as follows:
"Carburetor mounting shall must be of individual runners, with no balance pipes, and no plenums unless fitted as standard as on
the Rotax 493 and 593 engines. The use of the intake plenum/resonator on the 493 and the 593 engines is optional. If the intake
resonator is removed the resulting holes MUST be completely plugged and the plugs must be held in place by appropriate
clamps. Plugs may be of any material and must serve no other purpose than to plug the holes originally intended for the
resonator. 38mm intake boots, BPP 420867860 (last 6 digits 867860 are embossed on the boot), BPP 420867862 (last 6 digits
867862 are embossed on the boot), or Kimpex 07-100-33, or Moto Tassinari V-Force 3 Reed Valve System V3124-873B-
2 shall must be used for the 493 and 593 non-HO engines. 38mm intake boots, BPP 420867882 (last 6 digits 867882 are
embossed on the boot) or Moto Tassinari V-Force 3 Reed Valve System V3124-873B-2 shall must be used for the 2003 593 HO
engine, and 38mm intake boots, BPP 420867879 (last 6 digits 867879 are embossed on the boot) or Moto Tassinari V-Force 3
Reed Valve System V3124-873B-2 shall must be used for the 2004-2007 593 HO engines. Supercharging, turbocharging, and
direct fuel injection are prohibited."
In F500, GCR section 9.1.1.D.14, add a new section as follows:
"M. The stock oil injection pump, oil lines, and control cables may be removed from all Rotax engines. The oil injection ports may
be removed and plugged as necessary."

In FE, GCR section 9.1.1.I.2.M, change as follows:
"Tires must be run as delivered in sets of 4 as stated below:"

In FE, GCR section 9.1.1.I.2.K.c, change as follows:
"Master cylinders must be the Girling type:
Girling F front master cylinder is .700" piston diameter, Part # WM802005
Girling R rear master cylinder is .750" piston diameter, Part # WM802006"

In F500, GCR section 9.1.1.D.15.G, add the following:
"The exhaust system and exhaust manifold are unrestricted, within SCCA safety regulations, except that
stepped diameter exhaust headers are not allowed. This prohibition does not include the exhaust flange area immediately
adjacent to the cylinder head."
In F500 Engine Table, Honda CBR600RR, Suzuki GSXR600, and Yamaha R6 spec lines, add the following:
"Stepped diameter exhaust headers are not allowed"

In F500, GCR section 9.1.1.D.14, add a new section as follows:
"N. Alternate ECU for Rotax engines: The use of the Ingi Tech Sparker ignition part number DCP-CDI-P2 is permitted."

In EP Spec Lines, classify Volkswagen New Beetle (06-11) as follows:

A specification table follows in the original; it is not shown here.

Effective November 1, 2022, in EP Spec Lines, change Carburetor. No. & Type as follows:
Mazda RX-7 (12A/13B) (79-85):
"12A: (1) Nikki 4 bbl carburetor w/ primary choke(s) bored to match secondary choke(s) on a stock manifold or (1) Auto-type 2
bbl w/42mm choke(s) on a “dual-y” manifold. 13B: (1) Auto-type 2 bbl w/ 42mm choke(s) on a “dual-y” manifold, (1) 2 bbl fuel
injected throttle body w/ 42mm choke(s) on a “dual-y” manifold, or stock 13B fuel injection."
Mazda RX-7 (13B) (86-91):
"(1) Auto-type 2 bbl w/ 42mm choke(s) on a “dual-y” manifold, (1) 2 bbl fuel injected throttle body w/ 42mm choke(s) on a “dual-
y” manifold, or stock 13B fuel injection."

In EP Spec Line, VW Corrado (92-95), change as follows:
Bore x Stroke mm/(in.): "81.0 x 90.4 3 (3.19 x 3.56)"
Displ. cc/(ci) (nominal): "278 92"

In FE, GCR section 9.1.1.I.2.G.a.17, change as follows:
"A heat shield and heat insulation material may be used between the engine block and the exhaust system and is recommended
for the purpose of protecting hoses, shifter cable, and wiring from the heat of the engine and exhaust. Heat insulation material
may also be used to protect the fuel cell, fuel filter, fuel rail, and fuel lines."

In F500, GCR section 9.1.1.D.14.A, change as follows:
“Carburetor mounting must be of individual runners, with no balance pipes and no plenums unless fitted as standard as on the
Rotax 493 and 593 engines. The use of the intake plenum/resonator on the 493 and 593 engines is optional. If the intake
resonator is removed the resulting holes MUST be completely plugged and the plugs must be held in place by appropriate
clamps. Plugs may be of any material and must serve no other purpose than to plug the holes originally intended for the
resonator. 38mm i Intake boots, BPP 420867860 (last 6 digits 867860 are embossed on the boot), BPP 420867862 1 (last 6 digits
867862 1 are embossed on the boot), or Kimpex 07-100-33, or Moto Tassinari V-Force 3 Reed Valve System V3124-873B-2 must
be used for the 493 and 593 non-HO engines. Moto Tassinari V-Force V3120-794A-2 Reed Valve System may be used with any
allowed intake boot on the 493 and 593 non-HO engines. 38mm i Intake boots, BPP 420867882 (last 6 digits 867882 are
embossed on the boot) or Moto Tassinari V-Force 3 Reed Valve System V3124-873B-2 must be used for the 2003 593 HO engine,
and 38mm i ntake boots, BPP 420867879 (last 6 digits 867879 are embossed on the boot) or Moto Tassinari V-Force 3 Reed Valve
System V3124-873B-2 must be used for the 2004-2007 593 HO engines. Supercharging, turbocharging, and direct fuel injection
are prohibited.”

In FE, GCR section 9.1.1.I.2.K, add the following:
"f. Driver adjustable manual brake bias is allowed."

In FE, GCR section 9.1.1.I.2.F.g, change as follows:
"The front wing main plane, front wing secondary elements, front wing support mounts, and front wing endplates assembly and
its related mounting components must be used and mounted as delivered from Enterprises. Any m Modifications to these parts,
except as specifically noted herein, is strictly forbidden are prohibited. The front main wing plane angle is zeroed on the rear
upper aft transmission surface measured with a suitable angle gauge, i.e.: digital level on the top main plane 2 inches outward
from the nose box mounts element may be adjusted +2.5 to -0.5 degrees. It must meet a minimum measurement of negative .5
degrees (angled down in the back) and a maximum measurement of positive 2.5 degrees (angled up in the back). It is acceptable
to shim the main plane to obtain this measurement. Shimming 2 of the 4 verticals through the main element mounting points to
achieve adjustment range is allowed. The main element angle is measured relative to the reference plane. The main element is
checked on the upper surface, midway between the vertical mounting and outer secondary elements on both sides. Note: The
reference plane is the machined surface where the shock clevises are attached to the transmission case. Secondary wing
elements may be used in any of the provided adjustment holes. Gurney flaps (0.500" +/- 0.030") are permitted allowed as an
option for installation on the trailing edge upper surface of the front wing on secondary elements only, not the wing main
plane. They Gurney flaps must be securely attached in a secure fashion, without modification to the wing element except for
mounting hardware. Only .500” +/- .030” flaps are allowed. Maximum number of mounting locations on front flaps is 2 on each
flap and maximum hardware size is with two #8 (.156) hardware or tape. Gurney flaps, where attached, shall be are bent or
formed 90 degrees to have a sharp inner radiusand parallel to the upper surface of the wing element and. no t Tapered or "saw-
toothed" Gurneys flaps are not permitted. Gurney flaps are measured for total height as mounted from the upper surface of the
element."
In FE, GCR section 9.1.1.I.2.F.h, change as follows:
"The rear wing assembly and its related mounting components are to must be used and mounted as delivered. Any
m Modifications, except as specifically notedherei n, are strictly prohibited. The lower plane angle, zeroed on the rear upper aft
transmission surface, measured with a suitable angle gauge. i.e.; digital level on the top surface of the lower rear wing must
meet a minimum of –3.0 degrees (angled down in the back) and a maximum of +2.0 degrees (angled up in the back). It is
acceptable to adjust the lower rear element to meet these requirements element may be adjusted +2.0 to -3.0
degrees. Chamfering the upper inner corners of the wing mounting brackets to achieve the adjustment range is allowed. The
element angle is measured relative to the reference plane. The element is checked on the top surface, near the center, without a
Gurney flap. Note: The reference plane is the machined surface where the shock clevises are attached to the transmission
case. The upper rear wing element may only be adjusted within the parameter profile of the wing endplates and wing adjusters
as provided from Enterprises using any of the provided adjustment holes. No additional holes may be added. Gurney
flaps (0.250" +/- 0.030") are permitted allowed as an optionfor installation on the trailing edge upper surface of the on one or
both wing elements. They Gurney flaps must be securely attached in a secure fashion, without modification to the wing element
except for mounting hardware. Only .250” +/- .030” flaps are allowed on one or both elements with five #8 hardware or
tape.The Gurney flaps only, may extend beyond the parameters of the end plate are bent or formed 90 degrees to have a sharp
inner radius. Maximum number of mounting locations is 5 and maximum hardware size is #8 (.156). Gurney flaps, where degrees
and parallel to the upper surface of the wing element and no t Tapered or "saw-toothed"
Gurneys flaps are not permitted. Gurney flaps are measured for total height as mounted from the upper surface of the element."

In Production Category Specifications, GCR section 9.1.5.E.2.e.5., change as follows:
"Cylinder head ports may be matched to the intake and exhaust manifolds to a depth of no more than 1 inch from the port
mating surface."

In FE, GCR section 9.1.1.I.2.G.b.4.b, change as follows:
"(All SADEV ratios are under review and could be updated prior to sealing date)"

In HP, adjust model years of the "Ford Fiesta (11-16)" spec line as follows:
"Ford Fiesta (11-16 9)"
In FP, adjust model years of the "Chevrolet Sonic (12-16)" spec line as follows:
"Chevrolet Sonic (12-16 9)"

In HP Spec Lines, Volkswagen Rabbit Cabriolet 1780, delete in its entirely:
In HP, Spec Lines, Volkswagen Rabbit, change Title as follows:
“Volkswagen Rabbit 1588 (includes Cabriolet / convertible)”
“Volkswagen Rabbit 1715 (81-84) (excl. conv.)”
“Volkswagen Rabbit GTI 1780 (83-84)”

In FP Spec Lines, Austin-Healey Sprite Mk. I, II,III, IV MG Midget Mk I,II, III, IV & 1500, change Intake Valve Size as follows:
"(I) 36.65.3/(1.44)"
In FP Spec Lines, Triumph Spitfire Mk. IV & 1500, change Intake Valve Size as follows:
"(I) 36.65.5/(1.440)"
In HP Spec Lines, Triumph Spitfire 1500, change Intake Valve Size as follows:
"(I) 36.65.5/(1.440)"
In HP Spec Lines, Triumph Spitfire Mk. III & IV 1500, change Intake Valve Size as follows:
"(I) 36.65.5/(1.440)"

In EP Spec Lines, delete the Porsche 944/924S 2.5L (2V) (83-88) spec line entirely, and create a new spec line for Porsche
944/924S 2.5L(2V) 2.7L(2V) (83-89) as follows:

A specification table follows in the original; it is not shown here.

In FP Spec Lines, Toyota Corolla 2TC (71-74), change weight as follows:
"1853 1810"
In HP Spec Lines, Toyota Corolla (71-74), change weight as follows:
“1960 1910
* 2009 1958
** 2058 2006”

In EP Spec Lines, Triumph GT6, change weight as follows:
"1830 1800"

In FE, GCR section 9.1.1.I.2.N.f, change as follows:
"Any rain light is allowed. Effective 1/1/2024, a rain light that meets FIA Standard 8874-2019, Technical List No. 76, is required as
specified in GCR section 9.3.32.B.2."

In EP spec line, BMW Z3 2.5L, change weight as follows:
"2450 2500
*2511 2563
**2573 2625"

In EP Spec Lines, Mazda MX-5 /Miata 1.8L (90-97), change weight as follows:
"2200 2150"
Mazda MX-5 /Miata (94-97)
"2035 2000
*2086 2050
**2137 2100"

In EP spec line, Triumph GT6, make the following change in the Notes section:
"Two (2) 1.75” auto-type carburetors @ 1970 40 lbs. Three (3) Weber 40 DCOE on IR manifold with 28mm chokes @ 1990
lbs. Laycock overdrive, May use 5 speed gearbox w/o overdrive. Three (3) Weber 40mm DCOE w/28mm venturi on individual
runner manifold @ 2020 lb."

In FE, GCR section 9.1.1.I.2.P.c, add the following:
"Racer's tape may be used to repair crash damage, or as a precautionary means of securing the body panels or
retaining latches fasteners only. Crash-damage is defined as having occurred during the current event, and the tape should be of
an appropriate color if possible. Taping of body seams is not allowed. Taping across heat exchanger openings as a way to control
temperature is allowed and may serve no other purpose."

In EP spec line, Honda S2000, make the following changes to its spec line:
Fuel Injected Equipped Throttle Body Inside Diameter: "62 64"
Notes: "Comp. Ratio limited to 12.0:1. Valve lift limited to .500”. An adaptor plate can be used to mount the 62mm throttle body
from '00-05 to the '06-09 intake manifold. The adaptor plate can be no more than 1.25" thick, and its bore must not exceed the
"Fuel Injected Equipped Throttle Body Inside Diameter" maximum spec of 64mm."

In EP spec line, Triumph TR8 (78-81), move the "Dry sump allowed" wording to the appropriate location as follows:
Carburetor. No. & Type: “Zenith Stromberg carbs or fuel injection. Dry sump is allowed.”
Notes: “Comp. Ratio limited to 12.0:1, Valve lift limited to .500”. Dry sump is allowed.”

In EP spec line, Porsche 944/924S 2.5L (2V) / 2.7L (2V) (83-89), change Weight as follows:

A specification table follows in the original; it is not shown here.

In HP, make the following weight change:
Honda Civic 1.5 (88-91)
“2245 2175
*2301 2229
**2357 2284”

In HP Spec Lines, delete the following redundant spec lines in their entirety:
Spec line #10 - VW Rabbit Cabriolet 1780
Spec line #3 - VW Scirocco 1588
Spec line #4 - VW Scirocco 1780 (8-valve) (83-88)
Spec line #5 - VW Scirocco 1588

In EP Spec Lines, classify Nissan 300ZX (84-89), as follows:

A specification table follows in the original; it is not shown here.

Mazda RX-7 (92-97) as follows:

A specification table follows in the original; it is not shown here.

Spec Lines, make the following changes to the two Mazda RX-8 spec lines.
Remove spec line entirely:
Mazda RX-8 (04-11)
Remove the wording "alternate":
Mazda RX-8 (04-11)(alternate)
Spec Mazda (SM/SMX) None.

In HP Spec Lines, change Track (F/R)mm/(in.) as follows:
Volkswagen Golf (GTI, GT, GL) (85-92): "2 1537/1529 (60.5/60.2)"
Volkswagen Jetta (GLI, GL) (85-92): "2 1537/1529 (60.5/60.2)"

In FE, GCR section 9.1.8.I.2.M, add the following:
"b. Hoosier FE/FE2 Decal Placement:
Five (5) "Hoosier" decals are required in the following locations: One (1) small "Hoosier" decal on the nose or the front shock
cover of the car. One (1) 12" "Hoosier" decal on the outside vertical plane of each front wing plate. One (1) 12" "Hoosier" decal
on the vertical plane of each of the lower floor panels just in front of the rear wheels. Hoosier decals are available, free of charge,
from all Hoosier tire distributors and SCCA Enterprises."

In FE, GCR section 9.1.1.I.2.U.b.3, change as follows:
"Protest Fee: Regional -$25.00, National -$50.00. See GCR section 8.3.1.D for fees and payment procedure."
In SRF, GCR section 9.1.8.D.1.U.b.3, change as follows:
"Protest Fee: Regional -$25.00, National -$50.00. See GCR section 8.3.1.D for fees and payment procedure. Item 1 will be done by
the CSR or other shop that is equipped for this type of work and will be paid directly."

In FE, GCR section 9.1.1.I.2.U.b.3, change as follows:
"Protest Fee: Regional -$25.00, National -$50.00. See GCR section 8.3.1.D for fees and payment procedure."
In SRF, GCR section 9.1.8.D.1.U.b.3, change as follows:
"Protest Fee: Regional -$25.00, National -$50.00. See GCR section 8.3.1.D for fees and payment procedure. Item 1 will be done by
the CSR or other shop that is equipped for this type of work and will be paid directly."

In FE, GCR section 9.1.1.I.2.M.b, change as follows:
"Five (5) "Hoosier" decals are required in the following locations: One (1) small "Hoosier" decal on the nose or the front shock
cover of the car. One (1) 12" "Hoosier" decal on the outside vertical plane of each front wing plate. One (1) 12" "Hoosier" decal
on the vertical plane of each of the lower floor panels just in front of the rear wheels. Hoosier decals are available, free of
charge, from all Hoosier tire distributors and SCCA Enterprises Per Hoosier's contingency program, three (3) decals are required to
qualify for contingency awards. One (1) decal must be located on each side of the car and one (1) decal must be visible on the
front."

In HP Spec Lines, Austin-Healey Sprite MkI, II, III, IV MG Midget (ALL) - Level 2 - 1275cc, change Notes as follows:
"(Effective 11/1/2024) Compression ratio limited to 11 12.0:1"
In HP Spec Lines, Austin-Healey Sprite MkI, II, III, IV MG Midget (ALL) - Level 2 - 1098cc, change Notes as follows:
"(Effective 11/1/2024) Compression ratio limited to 11 12.0:1"

In FE, GCR section 9.1.1.G.2.K, add the following:
"g. If used, SCCA Enterprises Part # WM803010 Brake Line to Control Arm covers must be used as delivered and must be securely
fastened with zip ties/tie straps or tape. Part # WM803010 is the only approved part and may serve no other purpose."

In EP SPEC LINES, BMW 325i/is (E30) (84-91), change Weight as follows:
"2200 2150
*2255 2204
**2310 2258"

In EP Spec Lines, add to Notes as follows:
BMW Z3 2.5LL "(Effective 2/21/2025) 52mm Flat Plate Intake Restrictor is required."
BMW Z3 2.8L (97-00): "(Effective 2/21/2025) 55mm Flat Plate Intake Restrictor is required."
BMW 328i/is E36 (96-99): "(Effective 2/21/2025) 58mm Flat Plate Intake Restrictor is required."
BMW 328i/ci E46 (01-06): "(Effective 2/21/2025) 58mm Flat Plate Intake Restrictor is required."
BMW 325i/is E46 (01-06): "(Effective 2/21/2025) 56mm Flat Plate Intake Restrictor is required."
BMW 325i/is E-36 (92-95): "(Effective 2/21/2025) 56mm Flat Plate Intake Restrictor is required."
BMW 325is M-Technic (1994): "(Effective 2/21/2025) 56mm Flat Plate Intake Restrictor is required."

In EP Spec Lines, change Notes as follows:
BMW Z3 2.5LL "(Effective 3/1/2025) 56mm 52mm Flat Plate Intake Restrictor is required."
BMW Z3 2.8L (97-00): "(Effective 3/1/2025) 59mm 55mm Flat Plate Intake Restrictor is required."
BMW 328i/is E36 (96-99): "(Effective 3/1/2025) 62mm 58mm Flat Plate Intake Restrictor is required."
BMW 328i/ci E46 (01-06): "(Effective 3/1/2025) 62mm 58mm Flat Plate Intake Restrictor is required."
BMW 325i/is E46 (01-06): "(Effective 3/1/2025) 60mm 56mm Flat Plate Intake Restrictor is required."
BMW 325i/is E-36 (92-95): "(Effective 3/1/2025) 60mm 56mm Flat Plate Intake Restrictor is required."
BMW 325is M-Technic (1994): "(Effective 3/1/2025) 60mm 56mm Flat Plate Intake Restrictor is required."

In GCR, add new rule as Section 9.1.5.E.10.f:
"Any interior or exterior mirror(s) that meets rule 9.3.36 may be used."

In EP, Spec Lines make the following weight changes:

A specification table follows in the original; it is not shown here.

In EP Spec Lines, make the following weight change:
Mazda MX-5 /Miata (99-05):
"2150 2100
*2204 2153
**2258 2205"

In HP Spec Lines, classify the Chevrolet Spark (16-22):

A specification table follows in the original; it is not shown here.

In HP Spec Lines "Ford Festiva (88-93)" change as follows:
Weight:
"1700 1600
*1743 1640
**1785 1680"
Notes:
"Compression ratio limited to 10.5 11.0:1. Valve lift limited to .450”."

In HP Spec Lines, change Weight as follows:
Fiat X-1/9 & Bertone1500: “1790 1740 *1835 1784 **1880 1827”
Fiat X-1/9 1300: “1650 1600 *1691 1640 **1733 1680”
Fiat X-1/9 1300: “2060 2010”
Fiat X-1/9 1500: “1950 1900”

In EP Spec Lines, BMW Z4 (03-05), add to Notes the following:
“52mm Flat Plate Intake Restrictor.”

In EP Spec Lines, Fiat 124 Sport Spider 1600 & 124 Spider 2000, change as follows:
Weight: "2050 2000"
Carburetor No. & Type: "(2) Weber 40 IDF-40IFI, (2) Solex C40P116, 34 36mm choke(s) req’d, (2) Weber 45DCOE w/ 34 36 mm
choke(s) on I.R. manifold or fuel injection."

Effective 9/1/25 in FE, GCR section 9.1.1.G.1.A, change as follows:
"Definition
FE’s with the Mazda 2.0L MZR engine will be classed as “FE2” and will use the class designation FE2. The Mazda 2.0L MZR motor
can be used in all SCCA events. It shall run under all FE Preparation rules except as noted below:
a. 2.0L MZR may be run with an Elite 5SPD or a Complete SADEV 6SPD transmission Kit
Must use the following:
b. 2.0L only Intake Manifold Part # WM30106
c. Throttle Body Part # WM591930-Jenvey
d. PE ECU Kit Part # 1192012
e. Nippon-Denso Alternator Part # WM902127
f. Oil Filter Adaptor Part # WM301050 & Oil Filter Part # G301022
g. PCV Valve Part # WM391502
h. The car shall weigh 1270 lbs. minimum, including the driver.
i. 16” MAZDA logo on each side of the engine cowling and the Mazda wing & name logo on the front center of the nose cone.
These are mandatory decals.
j. 2.0L MZR required Spark Plug Part# ND ITV 24
Formula Enterprises cars "FE" with Mazda 2.0L MZR engine are classed as "FE2." FE2 is the primary class in all SCCA events and
must run under all FE Preparation rules except as noted below:
Mandatory items
16” MAZDA logo, each side of the engine cowling, Mazda wing logo, front center of the nose cone.
Table 2 (Spec Line Cars)
Car Engine
Wheel
Width
(in)
± .060
Aero Transmission Weight Notes

A specification table follows in the original; it is not shown here.

In FE, GCR section 9.1.1.G.2.F.k, change as follows:
"Enterprises bubble tail P/N: WM138014 is allowed for FE and is the only configuration for FE2."

In HP Spec Lines, Plymouth Arrow (76-80), add the following wording to Trans. Speeds(max):
"4 or 5"

In Appendix G.2.3, change as follows:
"Rim width and diameter are is absolute maximums."

In GCR, Section 9.1.5.E., change as follows:
9.1.5.E.1.b.4: "The inside dimensions of the throttle body casting/housing (as measured at the throttle butterfly) must remain
stock (tolerance of +/-.25mm), but the throttle body can otherwise be ported and polished."
9.1.5.E.2.b.4: "The inside dimensions of the throttle body casting/housing and all dimensions of the throttle butterfly must
remain stock (tolerance of +/-.25mm)."

In EP Spec Lines, Nissan 280Z, change Weight (lbs) as follows:
"(Effective 11/1/2025) 2560 2400
*2624 2460
**2688 2520"

In EP Spec Lines, Mazda MX-5 / Miata 1.8L (90-97), Effective 11/1/2025 make the following weight change:
"2150 2125"

In HP Spec Lines, Austin-Healey Sprite/Midget 1098cc, Effective 11/1/2025make the following weight change:
"1630 1550"

In HP Spec Lines, Volvo 142/142E P-1800 Engine, Effective 11/1/2025 add the following wording to Notes:
"Comp. Ratio limited to 12.0:1. Valve lift limited to .425”."

In HP Spec Lines, Mini Cooper (07-13) (includes 09-15 convertible and 12-15 Coupe), Effective 11/1/2025 make the following
changes to the Notes:
"Compression ratio limited to 11.0:1, Valve lift limited to .450”.390"."

In FP Spec Lines, make the following spec line correction:
"Volkswagen Rabbit (Includes Convertible Cabriolet)"
In HP Spec Lines, make the following spec line correction:
"Volkswagen Rabbit 1588 (Includes Cabriolet)"
"Volkswagen Rabbit 1715 (Includes Cabriolet)"
"Volkswagen Rabbit 1780 (Includes Cabriolet)"

In GCR, Section 9.1.5.E.7., change as follows:
"e. Cars fitted with rear drum brakes, can convert to rear disc brakes without penalty. Note that the “Brakes Std.” and “Brakes
Alt.” listings on a vehicle’s spec line do not prohibit a car that was fitted with rear drum brakes stock, from converting to rear
disc brakes under this rule. When converting from rear drum brakes to rear disc brakes:
1. Rear brake rotors must be solid and can be no larger in diameter than the largest permitted front brake rotor, as defined on
the vehicle’s spec line.
2. Rear calipers and mounting brackets are unrestricted but must be made of a ferrous or aluminum material. The standard and
alternate brake listings on a vehicle’s specification line, does not prohibit a car that was fitted with rear drum brakes as stock
from converting to rear disc brakes under this rule.
3. The “Brakes Std.” and “Brakes Alt.” listings on a vehicle’s spec line do not prohibit a car that was fitted with rear drum brakes
as stock from converting to rear disc brakes under this rule."

In EP Spec Lines, Ford Mustang (94-98) add the following to the Fuel Injected Equipped Throttle Body Inside Diameter column:
"60"

In EP Spec Lines, Triumph TR2, 3, 3A, 4, 4A, TR4, TR4A, IRS, make the following change to the Notes:
"Front apron assembly may be made of alternate material. Three (3) Weber 40 DCOE on IR manifold with 28mm chokes @ 1990
lbs. Laycock overdrive, may use 5 speed gearbox without overdrive."

In EP Spec Lines, make the following changes to Restrictors:
BMW Z3 2.5L: "52mm 50mm Flat Plate Intake Restrictor"
BMW Z3 2.8L (97-00): "55mm 53mm Flat Plate Intake Restrictor"
BMW 328i/is E36 (96-99): "58mm 55mm Flat Plate Intake Restrictor"
BMW 328i/ci E46 (01-06): "58mm 55mm Flat Plate Intake Restrictor"
BMW 325i/is (E46) (01-06): "56mm 53mm Flat Plate Intake Restrictor"
BMW 325is M-Technic (1994): "56mm 53mm Flat Plate Intake Restrictor"
BMW 325i/is E-36 (92-95): "56mm 53mm Flat Plate Intake Restrictor"
In EP Spec Lines, BMW Z3 2.5L, change Weight as follows:
"2500 2550
*2563 2614
**2625 2678"

In FE, GCR section 9.1.1.G.2.G.a.1, add the following:
"NO MODIFICATIONS ARE ALLOWED EXCEPT WHERE SPECIFICALLY AUTHORIZED WITHIN THESE RULES. This includes all fuel
injection and engine management components, including exhaust, cooling, electrical and lubrication systems. All systems are
subject to test procedures and must conform to OEM / SCCA Enterprises specifications as stated and supplied by Enterprises. All
fluids, except fuel, are unrestricted."
In FE, GCR section 9.1.1.G.2.T, add the following:
"If a competitor refuses to give their engine and/or unlabeled parts for testing per a request of the Class Compliance Chief (CCC)
or Chief Steward, the following penalties will automatically be imposed:"
In FE, GCR section 9.1.1.G.2.T.d, add the following:
"The car and drivetrain are suspended from competition until the unit(s) specified by the CCC or Chief Steward are replaced."
In FE, GCR section 9.1.1.G.2.T, add a new section as follows:
"g. Any drivetrain part found to be out of spec, during voluntary or involuntary inspection, will constitute a Drivetrain Violation.
Penalties may be assessed post event."