BoP Lab / Buttonwillow Raceway Park

F5 vs SRF vs F6 vs T2 pace at Buttonwillow Raceway Park

Quickest here: T2 1:51.198 Rylan Hazelton, Cal Club 2026 qualifying

F5SRFF6T2solid race · dashed qualifying · slower is lower

	Event	F5			SRF				F6				T2
	Event	Qual best	Race best	Trap	Qual best	Race best	Trap	vs F5	Qual best	Race best	Trap	vs F5	Qual best	Race best	Trap	vs F5
	Cal Club 2026 CALCL262026-02-21												1:51.198Rylan Hazelton · fastest of 10 · top 5 within 2.5s-2.867s (-2.51%)	1:51.454Rylan Hazelton · fastest of 10 · top 5 within 3.0s-1.304s (-1.16%)	146.6Patrick Howe+32.2 mph (+28.1%)
30 rule changes (SRF: 3, T2: 27)6 induction · 6 weight · 4 cars added · 3 suspension & brakes · 3 tyres & wheels · 1 aero · 1 wording · 6 othershowhide 2026-02-01 T2 Request to Add 2014-2017 435i to T2 #38991cars added 2026-02-01 T2 Consideration for Nissan Z & NISMO Z to Touring 2 Class #39296cars added 2026-02-01 T2 Allow Alt Bushing Material in Toe Links #39607suspension & brakes 2026-02-01 T2 Request for Classification of MG6 TCR in T2-TCR Class #39702cars added 2026-01-01 T2 Alternate Placement of Fuse Panel and Electronics Request #39370other 2026-01-01 T2 Rebalance Blackwing Cadillac T2 for 2026 #39426weight -50 lbs 2026-01-01 T2 C6 LS2 Corvette Parity Request #39472induction 2026-01-01 T2 T2 Tire Sizing #39490weight -25 lbs 2026-01-01 T2 Rear Spoiler for Mustang GT S550 (15-23) #39499aero 2026-01-01 T2 Clarify T4 Brake Rotor Allowance #39503suspension & brakes 2025-12-01 T2 Help the 2011-2014 s197Mustang GT and Boss302 Less Restriction #38523induction 2025-12-01 T2 Improving Competitiveness of Gen 5 Camaro SS #39021weight -50 lbs 2025-12-01 T2 Adjust T2 Darkhorse R #39346weight 2025-11-01 T2 ND Gearset Request for T4 #39166other 2025-11-01 T2 ND Spec Lines Wrong PT#'s #39170weight 2025-11-01 T2 Touring 2 Post-Runoffs BOP Adjustments and Changes #39274induction -50 lbs 2025-11-01 T2 Adjust rev limit on Spec Corvette in T2 #39282other 2025-10-01 SRF Add HD Oil Cooler #38979other 2025-08-01 T2 Incorrect Touring Heading #38451wording 2025-08-01 T2 Clarifications needed to BMW M2 CS cup line #38536tyres & wheels 2025-08-01 T2 Fix brake allowance supersessions. #38554suspension & brakes 2025-08-01 T2 C5 Corvette correction #38782induction 2025-05-01 T2 C6 T-2 Corvette 6 Liter Engine Restrictor #37490induction 2025-05-01 T2 370Z Mid link Replacement for True Coil Overs and OEM Wheel Size #38014tyres & wheels 2025-05-01 T2 T2 Cadillac tire #38210tyres & wheels 2025-04-01 SRF Driver Safety & Comfort #37966other 2025-04-01 SRF Update SADEV transmission specs #37992other 2025-04-01 T2 Please class the Darkhorse R in T2 #37295cars added 2025-04-01 T2 T2 350Z Spec Line Cleanup #37603weight 2025-03-01 T2 T2 BOP #37312induction
	Cal Club 2025 CALCL252025-02-22												1:54.065Oli Thordarson · fastest of 2	1:52.758Oli Thordarson · fastest of 2	114.4Oli Thordarson
74 rule changes (SRF: 13, T2: 61)16 suspension & brakes · 16 weight · 11 tyres & wheels · 7 induction · 4 cars added · 4 engine · 2 removed · 3 wording · 11 othershowhide 2025-02-01 T2 Mustang Update backdate #37275removed 2025-02-01 T2 BOP Adjustment for 2016 - Camaro SS/1LE #37434weight +100 lbs 2025-02-01 T2 BMW M235iR TCS CHANGE REQUEST #37470other 2025-02-01 T2 Request to Classify Club Spec in Appropriate Touring Classes #37523cars added 2025-01-01 T2 Remove spec lines that have expired #37269induction 2025-01-01 T2 BoP for the Various Mustangs #37185weight -50 lbs 2025-01-01 T2 Spec Corvette Line Clarification. #37441weight 2024-12-01 T2 Redundant Verbiage Regarding Mustang Spec Lines for Driveshaft #36484suspension & brakes 2024-12-01 T2 Request Less Restriction for Ls-3 Engined C6 Corvette #36810induction 2024-12-01 T2 Fuel Emissions Components #37076engine 2024-12-01 T2 fix brake wording #37129suspension & brakes 2024-12-01 T2 Evaporative emissions systems #37130engine 2024-12-01 T2 Move Spec Boxster to T4 #37158cars added 2024-12-01 T2 Corvette Wheels #37169tyres & wheels 2024-12-01 T2 BMW 320i Spec Line #37204other 2024-12-01 T2 Classification for a 2005 Cadillac CTS 3.6 liter 6 speed manual #37224cars added 2024-12-01 T2 Please Consider Allowing Update to the C5 Corvette #37298induction 2024-12-01 T2 Major error in lane, but nobody ran it. #37302removed 2024-11-01 T2 Spec Corvette Change for T2 #37127tyres & wheels 2024-10-01 SRF Update SRF3 Air Filter Rule #36681other 2024-10-01 SRF Update SRF Brake Rotor Thickness #36687suspension & brakes 2024-10-01 SRF Hoosier Tire Decal Placement #36739tyres & wheels 2024-09-01 SRF Protest Fee Clarification #36540wording 2024-09-01 SRF Update to Letter 36619 with new Hoosier Contingency Decal Info #36624tyres & wheels 2024-08-01 SRF Update Rain Tire Rule and Hoosier Decal Placement #36436tyres & wheels 2024-08-01 T2 Errors #36214induction -75 lbs 2024-08-01 T2 Subaru Appeal #36258other 2024-08-01 T2 S550 Brakes #36571suspension & brakes 2024-07-01 T2 Mustang T2/T3 #35877other 2024-07-01 T2 S550 Brakes #35926suspension & brakes 2024-07-01 T2 T2-T4 Driveshaft Mistake...? #36050weight 2024-07-01 T2 request for allowance of 6 piston calipers for T2 C5 corvettes #36126other 2024-07-01 T2 B8/8.5 Audi S4 T3 and T2 #36195cars added 2024-05-01 T2 Allow T4 and T3 RX8 to Disable/Remove Factory Oil Inj. #35761engine 2024-05-01 T2 Competition Adjustment Request/Wheel Size of E46 #35895tyres & wheels 2024-05-01 T2 Driveshafts #35916weight 2024-04-01 T2 Brake Request for 2009 Porsche Cayman #35723suspension & brakes 2024-03-01 T2 Reorganize Spec Lines #35375induction 2024-03-01 T2 370Z Brake Rotor Size Correction #35487suspension & brakes 2024-03-01 T2 Letter #35154 2018+ Mustang GT Expansion #35488suspension & brakes 2024-02-01 T2 2015+ Mustang Sway Bar and A-Arm Request #35154suspension & brakes 2024-02-01 T2 Brake Kits #35245suspension & brakes 2024-02-01 T2 Runoffs wording on Caddy in T2 #35377wording 2024-02-01 T2 More Car Lightening Stuff #35319weight 2024-02-01 T2 Inclusion of B-C spec cars in T4 #35374other 2024-02-01 T2 T2-T4 Set expiration dates on spec lines #35378induction 2024-02-01 T2 Reply to letter #35161 and #31661 #35384weight +75 lbs 2024-01-01 SRF Update SRF Rain / Brake Rule #34706suspension & brakes 2024-01-01 SRF Update SRF Brake Light Rule v1 #34853suspension & brakes 2024-01-01 SRF SRF / SRF3 Rule Updates #35268weight 2024-01-01 T2 Rebalance Blackwing Cadillac T2 #35079tyres & wheels 2024-01-01 T2 M2 CS RACING #35130weight -50 lbs 2024-01-01 T2 Spec Corvette in T2 #35139weight -175 lbs 2024-01-01 T2 T2 Viper BoP #35155tyres & wheels 2024-01-01 T2 BOP Adjustment for 5.0L Mustangs #35156weight +75 lbs 2024-01-01 T2 Take at Look at T-2 BOP #35161weight -50 lbs 2024-01-01 T2 C5 Corvette Spec Line Oversight #35169weight 2024-01-01 T2 Requested Update of Model Years of 370Z #35231other 2023-12-01 T2 M2 CS RACING #35122other 2023-10-01 SRF SRF Radiator Rule Update #34805other 2023-08-01 T2 Corvette LS2 Restrictor Plate Adjustment #34456induction 2023-08-01 T2 Blacking Cadillac Fuel Capacity #34624engine 2023-08-01 T2 Rules Clarification for Mazda RX8 Spec Line #34395weight 2023-08-01 T2 rule book corrections #34437wording 2023-08-01 T2 Ride Height Correction for the T3 Solstice. #34615suspension & brakes 2023-07-01 T2 370Z Obsolete Parts & NISMO Alternatives to SPL Parts #34297weight 2023-06-01 SRF Hoosier SRF Wet Front Tire Rule Update #34189tyres & wheels 2023-06-01 T2 2009 Porsche Cayman Classing Request #34147other 2023-05-01 SRF Update SRF Front W2 Rain Tire Part Number #34118tyres & wheels 2023-05-01 T2 C5 Z06 Straight Line Speed #33575weight 2023-04-01 T2 Allowance of any nonmetallic bushing material in T2 #33833suspension & brakes 2023-04-01 T2 Allow Adjustable stabilizer bar links #33861suspension & brakes 2023-03-01 SRF Update SRF Brake Rule #33469suspension & brakes 2023-03-01 T2 Honda Civic Type R Tire Size Increase #33672tyres & wheels
	Cal Club 2023 CALCL232023-02-24
140 earlier rule changes on record, in force before Cal Club 2023 (from 2019)29 weight · 27 suspension & brakes · 16 cars added · 10 tyres & wheels · 7 engine · 6 induction · 1 aero · 15 wording · 29 other · F500 Rotax 493 and 593 intake boots: removed Moto Tassinari V3124-873B-2 from 493/593 non-HO allowance, added Moto Tassinari V3120-794A-2 option for non-HO. · F500 Rotax engines now permit Ingi Tech Sparker ignition DCP-CDI-P2 as alternate ECU. · F500 clarifies stepped diameter exhaust headers prohibited except at cylinder head flange area. · F500 Rotax 593 intake boot options clarified; oil injection pump removal now permitted. · F500 Majors and Runoffs cars must install AIM part #X47KPFSOLO2R0 data box mount for Solo or Solo 2. · F5 cars must install AIM part #X47KPFSOLO2R0 data box mount for Majors and Runoffs. · F5 clarifies mechanical shifting only; throttle-cut and flat-shifter devices permitted if driver retains full control. · F5 single-seat open-wheel cars: rigid suspension becomes limited suspension in class definition. · F500 Rotax 593 HO engine now permitted; 875 lbs minimum weight, MA0242SP1020A or MA0242SP1063A restrictor, specific intake boots and piston required. · F500 Suzuki GSXR600 engine years extended from 2003-2013 to 2003-2019. · F5 request to adjust external jetting device cockpit control denied; no rule change made. · F5 cockpit adjustment request response published in Fastrack letter 28359. · F500 Honda CBR600RR, Suzuki GSXR600, Yamaha R6 restrictor reduced to 28mm from 29mm. · F500 Honda CBR600RR, Suzuki GSXR600, and Yamaha R6 minimum weights increase to 900 lbs.showhide 2023-02-01 T2 C5 Corvette Swaybars #33269other 2023-02-01 T2 Mustang OEM Grill Request #33333other 2023-01-01 T2 BMW M235iR/M240iR Aftermarket 2WNR Shocks Allowed - Touring 2 #33464suspension & brakes -50 lbs 2023-01-01 T2 Touring (T2-T5) Category #33617tyres & wheels 2023-01-01 T2 ENO 9.1.9.2.D.1.e.1.a. #33651other 2022-12-01 T2 Heavy Cars #33345weight +125 lbs 2022-09-01 F5 Intake Boots Correction #33028wordingwordingF500 Rotax 493 and 593 intake boots: removed Moto Tassinari V3124-873B-2 from 493/593 non-HO allowance, added Moto Tassinari V3120-794A-2 option for non-HO. 2022-08-01 F5 Ensure availability of ECU for Rotax engines #32695engineadded · engineF500 Rotax engines now permit Ingi Tech Sparker ignition DCP-CDI-P2 as alternate ECU. 2022-07-01 F5 Clarify stepped exhaust header references #32743wordingwordingF500 clarifies stepped diameter exhaust headers prohibited except at cylinder head flange area. 2022-06-01 F5 593 carb boot availability and oil pump clarification #32527wordingwordingF500 Rotax 593 intake boot options clarified; oil injection pump removal now permitted. 2022-06-01 SRF SRF Tire Rule Update #32614tyres & wheels 2022-06-01 SRF Brake, seal, and air filter clarifications #32670suspension & brakes 2022-06-01 T2 BMW M235iR/M240iR Min Weight Clarification #32430weight 2022-06-01 T2 Follow up to Letter 30888 #32477other 2022-05-01 T2 Request Alternate Front & Rear Strut/Shock Top Hats #32452suspension & brakes 2022-05-01 T2 Request BoP E92 torque #32456other 2022-05-01 T2 Classify Cadillac Blackwing #32535cars added 2022-04-01 T2 Request to Allow the Use of Aftermarket ECU's in Touring #31067engine 2022-04-01 T2 BMW M2 CS Cup 2020- Exhaust #32243tyres & wheels 2022-04-01 T2 RequestT2 classification- 2022 Cadillac CT4-V Blackwing #32263cars added 2022-03-01 F5 E&O class name #32194otheraddedF500 Majors and Runoffs cars must install AIM part #X47KPFSOLO2R0 data box mount for Solo or Solo 2. 2022-03-01 T2 Reply to letter #31486/29879 T2-T4 Grill openings #31935suspension & brakes 2022-03-01 T2 C6 Restrictor Help #31995induction 2022-02-01 T2 BMW Z4M Adjustment #31885weight -50 lbs 2022-01-01 F5 Data Box Mounting Plate #31638otheraddedF5 cars must install AIM part #X47KPFSOLO2R0 data box mount for Majors and Runoffs. 2022-01-01 T2 Touring 2 BOP adjustments for 2022 #31480weight -50 lbs 2022-01-01 T2 Reply to letter 29879 T2-T4 Grill Openings #31486suspension & brakes 2022-01-01 T2 Request to clarify radiator hoses #31682wording 2022-01-01 T2 Clarify Permitted/Allowed #31743suspension & brakes 2022-01-01 T2 SMG #31837other 2021-12-01 SRF Three Updates to SRF Rules #31523weight 2021-12-01 T2 Typo for BMW M2 CS Cup 2020 #31173suspension & brakes 2021-11-01 T2 Request to Classify 2014 VW Jetta 1.8t TSI #30436cars added 2021-11-01 T2 Request new car 2017 BMW M2 #30486cars added 2021-11-01 T2 Request to Classify Porsche 997.2 GTS in T2 (body not = to C2S) #30686cars added 2021-09-01 T2 BMW M2 CS Power Stick Part Number #31087wording 2021-08-01 F5 Clarify allowable assisted shifting systems #30871wordingwordingF5 clarifies mechanical shifting only; throttle-cut and flat-shifter devices permitted if driver retains full control. 2021-08-01 F5 Request to correct terminology #30976wordingwordingF5 single-seat open-wheel cars: rigid suspension becomes limited suspension in class definition. 2021-08-01 SRF SRF Wet Tires #30849tyres & wheels 2021-08-01 SRF SADEV-SRF3 Transmission #30926other 2021-08-01 SRF SRF Update Maintenance, Repairs and Seals #30961engine 2021-08-01 T2 997.1 EO #30933other 2021-07-01 T2 Request #30406weight 2021-06-01 F5 Request to Allow Rotax 593 HO Engine #30712cars addedaddedF500 Rotax 593 HO engine now permitted; 875 lbs minimum weight, MA0242SP1020A or MA0242SP1063A restrictor, specific intake boots and piston required. 2021-06-01 SRF SRF3 Alternator Pulley #30684weight 2021-06-01 T2 Civic Type R Brake Rotors #29817suspension & brakes 2021-06-01 T2 Mustang S550 Parity in T2 #29925other 2021-06-01 T2 Request BOP on BMW Z4 T2 car #30597weight +50 lbs 2021-06-01 T2 E92 #30639weight -50 lbs 2021-05-01 T2 C5/6 Corvette in T1, T1-LP and T2 Dry Sump Standardization #29046other 2021-05-01 T2 Request for Chevrolet Camaro 1LE (2016-) Auto Trans #29067other 2021-05-01 T2 Request E46 M3 Minimum Competition Weight #29429weight -100 lbs 2021-05-01 T2 Request to add 2015 to Chevrolet Camaro SS/1LE 2010-2014 #29736other 2021-04-01 T2 Request consistency review in GCR #30263other 2021-04-01 T2 Class Spec Corvette in T2? #30297cars added 2021-04-01 T2 E92 BMW Spring Rate Request #30391suspension & brakes 2021-04-01 T2 Please correct recent T2 Spec Line #30401suspension & brakes 2021-03-01 SRF Mandatory identification: #30223engine 2021-03-01 T2 Request BMW M2CS door glass removal #30254other 2021-02-01 T2 Request Addition of BMW M240iR #29503weight 2021-02-01 T2 2021 Toyota Supra #29567cars added 2021-02-01 T2 Request Cold Air Intake for Honda Civic Type R #29942induction 2021-02-01 T2 Adjust T2 spec line that was missed in T2 BOP #30055weight -50 lbs 2021-02-01 T2 Fix T2 Mustang spec line #30106other 2021-02-01 T2 Z4 Wheel Size #30113tyres & wheels 2021-02-01 T2 Clarify T2 Spec lines #30194tyres & wheels 2021-01-01 T2 Request to Classify BMW M2 CS #29523cars added 2021-01-01 T2 350Z Rear Caliper Replacement #29710other 2021-01-01 T2 Request Mustang 8.8ÃƒÂ¢Ã¢â€šÂ¬Ã‚Â rear axle replacement #29860other 2021-01-01 T2 Cap year range on all 86s #29908other 2020-12-01 SRF SRF Shocks, Springs and Ride Height. #29688suspension & brakes 2020-12-01 T2 Request to Reevaluate T2 Spec Line for E92 M3 #28266weight -50 lbs 2020-12-01 T2 Request for Parity Among Vehicles Including S550 Mustang #29486weight -75 lbs 2020-12-01 T2 Alfa Romeo 4C Launch Edition #29531other 2020-10-01 F5 Request to Update Suzuki Engine Years for F500 #29453engineadded · engineF500 Suzuki GSXR600 engine years extended from 2003-2013 to 2003-2019. 2020-10-01 T2 Request 2018+ mustang swaybar update #28659suspension & brakes 2020-09-01 T2 Request to Clarify New 2-piece Brake Rotor Rule #29106suspension & brakes 2020-09-01 T2 please consider BoP for the following cars in T2 #29266weight -50 lbs 2020-09-01 T2 Request clarification on most recent approval by the Board #29284suspension & brakes 2020-08-01 T2 Request to correct GCR for 2018+ FORD Mustang GT & Ecoboost #28803wording 2020-07-01 F5 Request for Cockpit Adjustment of External Jetting Devices #28359wordingunclearF5 request to adjust external jetting device cockpit control denied; no rule change made. 2020-07-01 F5 Two Stroke Motors (reply to #28359 WDYT) #28816engine 2020-07-01 F5 Re letter requesting driver adjustable carb mixture #28840other 2020-07-01 F5 #28359 WDYT Request for Cockpit Adjustment #28875wordingunclearF5 cockpit adjustment request response published in Fastrack letter 28359. 2020-07-01 T2 Request to Add a Vehicle to the Roster (contd.) #27698other 2020-07-01 T2 Request brake upgrade and electric power steering pump #28946suspension & brakes 2020-06-01 T2 Request to Classify 2004 Mercedes Benz 320 CLK #27663cars added 2020-06-01 T2 Consider coil spring conversion Corvette in T2 #28824suspension & brakes 2020-05-01 SRF SRF Bump Stop Correction #27019suspension & brakes 2020-05-01 T2 Please Add the Following BBK to Allowed List for E92 M3 #28421wording 2020-05-01 T2 C5 Weight Adjustment #28433weight -50 lbs 2020-05-01 T2 Z3M Roadster Weight #28437weight 2020-04-01 T2 Limit Changes to the 997.2 Porsche #28242aero 2020-04-01 T2 Correct T2 Mustang Transmission #28732wording 2020-03-01 T2 Request to Readjust the T2 Porsches #27746induction 2020-02-01 T2 Please Switch the Solstice GXP as Specified in T2, to T3 #27413weight -50 lbs 2020-02-01 T2 Request for Two Piece Stop Tech Brake Rotors #27582suspension & brakes 2020-02-01 T2 Request to Classify all Mazda RX8 Models in T3/T4 #27606cars added 2020-02-01 T2 Request for Alternative Brake Kit on Nissan 370Z #27912suspension & brakes 2020-02-01 T2 2015- Current Ecoboost Mustang #27971weight -100 lbs 2020-02-01 T2 T2 Mustang #28022tyres & wheels 2020-01-01 F5 Change 600cc restrictor size #27883inductionslower · inductionF500 Honda CBR600RR, Suzuki GSXR600, Yamaha R6 restrictor reduced to 28mm from 29mm. 2020-01-01 T2 Clarification of On-Board Fire System for T2 #27183wording 2020-01-01 T2 Mustang Ecoboost and GT Transmission #27439other 2020-01-01 T2 Request for Dailey Engineering Dry Sump on 2010 Camaro SS #27514engine 2020-01-01 T2 Request for Half Shafts - 2014 Camaro SS 1LE #27584induction 2020-01-01 T2 Request for Parity Among Vehicles #27665weight -50 lbs 2020-01-01 T2 Request for 2016-2020 Camaro SS Help #27776weight -50 lbs 2020-01-01 T2 Request for Competitive Adjustments to Honda Civic Type R #27839weight -50 lbs 2020-01-01 T2 T4 RX8 Classification Error #27902wording 2020-01-01 T2 Request to add Toyota 86 GT to Spec Line #27910other 202-01-01 SRF SRF Rain / Brake Rule - BoD approved as follows #34958suspension & brakes 2019-12-01 SRF SRF Tire Warmer Rule #27622tyres & wheels 2019-12-01 SRF SRF / SRF3 Nose Weight Reduction #27706weight 2019-12-01 SRF SRF / SRF3 Majors & Regional Class Updates #27723other 2019-08-31 F5 Request for Weight Increase for Motorcycle Powered Cars #27214weight +25 lbsslower · weightF500 Honda CBR600RR, Suzuki GSXR600, and Yamaha R6 minimum weights increase to 900 lbs. 2019-08-31 T2 Request spare tire/wheel clarification #27012tyres & wheels 2019-07-01 SRF SRF Dash Windscreen Kit #27028other 2019-07-01 T2 Request to change Cadillac CTS-V years from 06-07 to 04-07 #26842cars added 2019-07-01 T2 Request to allow Hotchkiss front / rear sway bars on T2 CTS-V #26845suspension & brakes 2019-07-01 T2 Consider T2 06-07 Cadillac CTS-V BoP #27022induction 2019-07-01 T2 Correct T2 Mustang tire size #27024tyres & wheels 2019-05-31 T2 2018+ Audi TT RS Suspension Allowances #26631suspension & brakes 2019-05-31 T2 Request BOP adjustment for 2018 Honda Civic Type R-TIR removal #26882weight +150 lbs 2019-04-01 T2 Request for Removal of Rear Anti-roll Bar in T2 Mustang GT #26533suspension & brakes 2019-03-01 T2 Request Mustang GT Limited Prep 2018 Classification #24431cars added 2019-03-01 T2 Request to Classify 2018 Audi TT RS #25961cars added 2019-03-01 T2 Request for Adjustments on 2017+ Civic Type R #25969suspension & brakes 2019-03-01 T2 Correct Mazda MX-5 Hard Top Notes #26137weight 2019-03-01 T2 Consider opening class rules to allow any thermostat #26187wording 2019-03-01 T2 Ford Mustang Boss 302 (12-13) - correct weight #26287weight -50 lbs 2019-03-01 T2 Request camber correction 005-2013 corvette C6 #26288suspension & brakes 2019-03-01 T2 Request 98-02 Firebird 98-02 Camaro reloacte rear spring #26291suspension & brakes 2019-03-01 T2 Cap 2016 Mazda Miata year at 2018 #26388other 2019-03-01 T2 Class Ford Mustang GT 2018+ (reference letter 24431) #26400cars added 2019-01-01 T2 Errors, Omissions, and Updates (Various) #22414weight 2019-01-01 T2 Request to classify 2015 Cayman GTS 3.4L in T2 #25335cars added 2019-01-01 T2 Request for 2017-2018 Honda Civic Type R - 4 BOP Grill #25513other 2019-01-01 T2 Add Clarification to Spec Car Classifications Vehicle Spec #25774weight 2019-01-01 T2 Clarify Subframe Bushings Permitted for T2-T4 #25800suspension & brakes

Best is the class's fastest lap in that event's qualifying or race sessions, with the driver who set it, how many cars set a time that session and how close the top five were; a best from fewer than three cars is greyed. With two or more classes, "vs" is the gap of each class's best to the first class's at the same event. Newest event first. The coloured figure under each value is the change from the previous event that has one (green is quicker, red slower). Whole laps only, so events with different sector layouts still compare. Weather and track condition are not accounted for.