HSR 2020 RACE / ENDURO CLASSES (updated 1/20/2020) Grp 2 Vintage Sports Cars & Sedans as produced and raced thru +/- 1967* Class Enduro E-class (VP) Vintage Production Cars, thru ~ 1967 SCCA A/B-Production (early): Corvette C-1; ; Ferrari; Jaguar 120/140/150; 356 2.0L, etc. VP/1 V V3 SCCA C-Production (early): Lotus S7, Elan, Europa; Ginetta G4; Morgan SS; Alfa GTZ, etc. VP/2 V V3 SCCA D-Production (early): A-Healey 3000; Datsun 2000; Porsche 356, 911 (FIA); TR4; Morgan +4; Volvo P1800; Yenko Stinger, etc. VP/3 V V4 SCCA E-Production: A/R Giulia; A-Healey 100-4/6; MGB; Fiat 124; Elva Courier; Morgan 4/4; 912; TR3, GT6; Turner 1500; TVR, etc. VP/4 V V5 SCCA F-Production: Datsun 1600; Spridget 1275; Spitfire 1296/1500; MGA; Sunbeam Alpine; Fiat 124, etc. VP/5 V V5 SCCA G-Production: A/R Giulietta; Datsun 1500; Fiat X1/9; Spridget 1100; Spitfire 1147; Turner 950, etc. VP/6 V V5 SCCA H-Production: Sprite 948; Fiat 850; Fiat Abarth; MG Tc/Td/Tf; Opel GT, etc. VP/7 V V5 Vintage B-Sedans, etc. (over 1.5L): Jaguar Mk II; Corvair; Volvo 544/122; , etc. S/5 V V4 Vintage C-Sedans, etc. (under 1.5L): ; Fiat; Abarth; NSU; Saab, etc. S/6 V V5 (VM) Vintage Sports Racing Cars (Modifieds), pre ~ 1961 SCCA B, C -Modifieds (Over 3.0L): Jaguar; Echidna; Lister; Scarab; Ferrari; Bocar, etc. VM/1 V V3 SCCA D-Modifieds (2.0L - 3.0L): Aston Martin; Ferrari; Maserati, etc. VM/2 V V4 SCCA E, F-Modifieds (1.2L - 2.0L): Porsche RSK, RS 60, 61; Lotus 11, 15, 17; Elva II-VI; Lola I; OSCA, etc. VM/3 V V5 SCCA G, H-Modifieds (Under 1.2)L: Bandini; Berkeley; Elva, Lotus; Jabro; Devin, etc. VM/4 V V5 (VSR) Vintage Sports Racing Cars, 1961 ~ 1967 C-Sports Racers, under 1.3L: Merlyn, Landar; Lotus; Royale; Bobsy, etc. VSR/3 V V3 D-Sports Racers, H-Modifieds, under 1.0L: Bobsy, Ocelot; LeGrand; Quasar, etc. VSR/4 V V5 (SS) Street Stock Series Street Stock Touring : (Firehawk, Escort, IT, Motorola, Luk, etc.) [may use Gr3 tires] see HSR Street Stock Category Rules SS/D V V4 Unspecified cars running in group but not eligible for awards, points or podium 2X V VX

Grp 3 Vintage Sports Cars & Sedans as produced and raced thru +/- 1985* Class Enduro E-class (HP) Historic Production Cars post ~ 1967 *SCCA B-Production: Shelby GT350; Corvette 327; Porsche 904/GTS; XKE *(limited prep) HP/5 V V2 SCCA GT3: Porsche 914/6 (2.2/2.4L); 911 (2.2/2.5L); Datsun 280Z; MGB/V8 (3.5L), etc. HP/6 V V2 SCCA C-Production (late): Porsche 911R 2.0L, 914/6GT 2.0L; Datsun 240/260Z; Lotus 26R, 47, Sunbeam Tiger, etc. HP/7 V V3 SCCA D-Production (late): Jensen Healey; TR6; Porsche 914, 914/6 (2.0L, single plug), 924, 944; Mazda RX7; A/R Spider, etc. HP/8 V V4 *Early SCCA A-: 5.0L limit: Mustang; Barracuda, Valiant, Dodge Dart; Falcon, etc. *(limited prep) S/2 V V2 IMSA RS Sedans: post 1972 specs (IMSA RS, SCCA 2.5 Challenge, etc.): VW Rabbit, Colt, Pacer, Gremlin, Charger, RX2/3, Vega, etc. S/3 V V3 SCCA B-Sedan: pre 1972 specs: Datsun 510, 610; Alfa GTV; BMW 2002; Pinto; ; Volvo 142/144, etc. S/4 V V4 Small-bore production [ProdCar]: (post 1972 SCCA H/P, G/P, F/P specs - slicks allowed) H/PC V VX Modified Production GT & Sedans: cars deemed appropriate for Gr. 3, modified beyond approved specifications MP/3 V V2 (SS) Street Stock Series Street Tuner C: Street Stock cars with limited modifications including aero enhancements by application and individual acceptance ST/C V VX Street Stock Grand Sport: (Firehawk, Escort, IT, Motorola, Luk, etc.) see HSR Street Stock Category Rules SS/B V V2 Street Stock Sport: (Firehawk, Escort, IT, Motorola, Luk, etc.) see HSR Street Stock Category Rules SS/C V V3 (VSR) Vintage Sports Racing Cars SCCA CSR/USRRC (1964 ~ 72) under 1.6L: Royale RP; Bobsy; Lotus 23c, etc. VSR/1 V V1 SCCA E/F-Modified (thru ~ 1964) under 1.6L: Lotus 23b; Elva Mk 7/8; Merlyn, etc. VSR/2 V V1 (MSR) Modern Sports Racing Cars Modern Sports Racers: (SRF); Toyota WSR, Sports , etc. MSR/3 V V1 Unspecified cars running in group but not eligible for awards, points or podium 3X V VX HSR 2020 RACE / ENDURO CLASSES (updated 1/20/2020) Grp 4 Vintage/Historic/Modern Formula (Open-wheeled) Cars GT3 GTM GTM3 4a (VF) Vintage Formula Cars Classic Monoposto (Monoposto Racing rules apply) {approved treaded tires} Formula 1/2; pre 1973 VF/1 NA NA Formula B; pre 1973 (1600cc) VF/2 NA NA Club Ford; post 1973 (1600cc-spec tires) VF/3 NA NA ; pre 1973 (1600cc-spec tires) VF/4 NA NA (rear engine) (1100cc) VF/5 NA NA , Front engine FJ (1100cc) VF/6 NA NA (HF) Historic Formula Cars Monoposto Formula 70 (1973 - 1979) (Monoposto Racing F/70 rules apply) {slicks} 4b Formula 1 / / Formula A (over 2.0L) HF/1 NA NA Formula 2 (2.0L) HF/2 NA NA Formula B/Atlantic (1600cc) HF/3 NA NA Formula C/Continental/Super Vee HF/4 NA NA (MF) Modern Formula Cars, post 1979 4c F/1, Indy Car; post 1990 MF/1 NA NA F/1, Indy Car; pre 1990, also modern (02-15) MF/2 NA NA Indy Lights, F/3000, F/Holden, etc. MF/3 NA NA F/2, Toyota Atlantic, etc. MF/4 NA NA FF2000, F/Continental, etc. MF/5 NA NA Unspecified cars running in group but not eligible for awards, points or podium 4X NA NA Note: Post 2015 cars may run but will not be eligible for points or podium (HSR Five Year Rule)

Grp 5 Classic Big-Bore Sportscars and Sedans Class Enduro E-class (HP) Historic Production Cars, 1967 +/- 1975 (listed treaded tires)* SCCA A-Production: Corvette C-2/3 454/427; Cobra 427, etc. HP/1 GTC GTC2 SCCA B-Production: Corvette C-2/3 327/350; Shelby GT350; AMX; Jaguar XKE, XJS, XKE V12; Ferrari GTB, Porsche 930, etc. HP/2 GTC GTC3 Porsche RS Cup: Porsche 911 RSR, IROC (3.0L), etc. HP/3 GTC GTC3 SCCA GT2: BMW 3.0/3.5 CSL; MGB/GT V8 (3.9-4.2L); Porsche 911 (2.7-2.8L); 914/6 (2.5L), etc. HP/4 GTC GTC4 Classic Trans-Am thru 1972 (5.0L): Camaro; Firebird; Mustang; Boss 302; Barracuda; Javelin, etc. H/TA GTC GTC3 American Sedans (over 5.0L): Mustang; Camaro; Dodge; Plymouth Barracuda; Firebird, etc. S1 GTC GTC4 (MP) Modified Production Cars, 1967 +/- 1975 (listed treaded tires)* Modified Production GT & Sedans, over 5.8L: cars deemed appropriate for Gr 5, modified beyond approved specifications MP/1 GTC GTC1 Modified Production GT & Sedans, under 5.8L: cars deemed appropriate for Gr 5, modified beyond approved specifications MP/2 GTC GTC2 IMSA 1975 - 1984 GTU/SCCA GT2/3: under 3.0L (slicks permitted) GTU H H7 (SS) Street Stock Series Street Stock Supercars , etc: Corvette ZR1; Dodge Stealth; ; Ferrari 348/355; Nissan 300ZX-T; Porsche 911/T; Mazda RX7/T, etc. SS/AA GTC GTC1 Street Stock Super Sport: (GrandAm-ST, Firehawk, Escort, IT, Motorola, Luk, etc.), see HSR Street Stock Category Rules SS/A GTC GTC4 Street Tuner B: Street Stock cars with limited modifications including aero enhancements by application and individual acceptance ST/B GTM GTCX/GTM6 Select USRRC/FIA World Sportscar Championship coupes {listed treaded tires} ASR/USRRC over 2.0L: Cheetah; Corvette GS; Corvair V8; Daytona Coupe; BT8, etc. V/ASR GTC GTC2 BSR/USRRC under 2.0L: Porsche 906; Elva BMW; Chevron B16; Lola T210/212, etc. V/BSR GTC GTC2 Unspecified cars running in group but not eligible for awards, points or podium 5X GTC GTCX

Grp 6 Historic / Post-Historic / Modern Era Prototypes Class Enduro E-class ( FIA) LeMans Prototypes / World Sports Cars / Daytona Prototypes *Current FIA/IMSA Prototypes (post '14): Ligier; R18e; Nissan, Toyota TS; Porsche 919, HPD/ARX-03; Toyota B12/60, etc. 6X P PX IMSA/FIA Prototypes (P1/LMP1/LMP900/LMGTP/SR1) post '98: Audi R8/10; Pescarolo; Peugeot 908; Lola B2K, etc. LMP1 P P1 IMSA/FIA Prototypes (P2/LMP2/LMP675/SR2/PC) post '98: FLM 09; Porsche RS Spyder; Pilbeam; Lola; Courage; Acura, etc. LMP2 P P2 FIA World Sports Cars (WSC) '94-98: Ferrari 333SP; R&S III; Kudzu; Cannibal; Hawk; Spice; Chevron, etc. WSC P P2 GrandAm/IMSA Daytona Prototypes (Gen 3) '12-15: Corvette Coyote DP; Riley XXVI DP/1 P P2 GrandAm/IMSA Daytona Prototypes (Gen 1/2) '03-11: Riley XI/XX; Doran; Crawford; Dallara, etc. DP/2 P P3 IMSA GTP / FIA FIA Group C, IMSA GTP: ; Nissan; Toyota; Jaguar XJR; Porsche 956/962, etc. GTP P P4 FIA Group C2, IMSA Camel Lights: Spice; Kudzu; Tiga; Alba; Argo; etc. GTPL P P5 Unspecified cars running in group but not eligible for awards, points or podium 6X P PX *Note-1: Post 2015 cars may run but will not be eligible for points or podium (HSR Five Year Rule) HSR 2020 RACE / ENDURO CLASSES (updated 1/20/2020) Grp 7 Historic / Post-Historic Sports Racing Cars (slicks) Class Enduro E-class Can-Am / USRRC / FIA Gr 6 / A, B, C Sports Racer / Classic Can-Am/ASR, pre 1974, (over 6.5L): McLaren M20, M8; Shadow DN4; Lola T163, T222, T260, T310, etc. CA1 H H1 Classic Can-Am/ASR, pre 1974, (under 6.5L): McKee, McLaren M6, M12; , T160; , 610; , 917, etc. CA2 H H1 Can-Am/ASR; post 1974, (2.0 - 5.0L): , T333, 430, T530; Ralt RT2; Prophet; Frisbee; March, Chevron B54, Schkee, etc. CA3 H H1 FIA Gr 6, Championship For Makes Coupes thru '74: Lola T70 MkIII; GT40; Ferrari 330, 512; Mirage, etc. H/PT H H2 Early Can-Am, USRRC (treaded tires): Lola T70; McLaren M1; Genie; McKee; /40, etc. USRRC GTC GTC1 FIA Championship of Makes Prototypes thru '74 (treaded tires): GT40; Lola Mk IIIb; Porsche 908/910/917; Mirage, etc. V/PT GTC GTC1 Historic B Sports Racers/World Sportscars (under 2.0L): Chevron B19/21/23/36; Lola T212/292; Osella; Toj, etc. H/BSR H H3 Historic C/D Sports Racers (under 1.8L): LeGrand, Kohler, Ocelot, etc. H/CSR H H4 Sports 2000 (later) post ~ '85: Lola; Carbir; Pratt-Miller; Van Diemen; Swift DB5, etc. S2/A H H4 Sports 2000 (early) thru ~ '85: March; Swift DB2; Royale; Shrike; Tiga, etc. S2/B H H4 Unspecified cars running in group but not eligible for awards, points or podium 7X H HX

Grp 8 American Stock Cars, NASCAR, etc. Class Enduro E-class Modern Era (1996-2006); Nextel/Sprint/Nationwide/CoT SC/A GTM GTM1 Winston/Busch Cup Era (1980-1995); SC/A cars running "limited" specifications. SC/B GTM GTM2 American Stock Cars built under local series rules using alternate body panels (GRP), Nascar Trucks, etc. SC/C GTM GTM2 Grand National Era; thru 1979 SC/D GTC GTC1 "Super" stock cars: (Pre-existing HSR stock cars built beyond series specifications) SC/E GTM GTM1 Note: Post 2015 cars may run but will not be eligible for points or podium (HSR Five Year Rule) 8X GTM GTMX

Grp 9 Historic / Modern Era - GTS / GT1 / GT2 / GT3 LM-D / TransAm Class Enduro E-class Trans-Am / SCCA GT1/2 / FIA GT1/2/3 IMSA/FIA/SCCA: GTLM, GT1/GTS1/GTLM/TA1; '08 ~ '15: BMW E92; Corvette C6 ZR1; Porsche 997 RSR; ; Viper GTS-R, etc. GT1/A GTM GTM1 IMSA/FIA/SCCA: GT1/GTS1; '98 ~ '07: AM DBR9; /575; Corvette C5/6-R; Maserati MC12; Viper GTS-R; S7-R, etc. GT1/B GTM GTM1 IMSA/FIA/SCCA/Trans-Am/ GTO/GT1/GTS1; '85 ~ '97: Panoz GTR-1; Porsche GT1; Corvette; Camaro; Mustang; Merkur; Capri, etc. GTS1 H H5 IMSA/FIA/GrandAm: GTD, GT2/GTE/TA2; '04 ~ '15: Ford GT; Camaro GT-R, Corvette C6-R, Panoz Esperante; Ferrari 430/458; Spyker, etc. GT2/A GTM GTM2 IMSA/FIA: GT2; '99 thru ~ '04: Corvette C5-R; Viper; Porsche GT2, etc. GT2/B GTM GTM3 IMSA/FIA GT3; '06 ~ '14: Viper GTS; Porsche 997 RSR; 991.1 RS/RSR; BMW M3; Aston Martin; Ferrari 430/458, etc. GT3 GTM GTM3 World Challenge GT3 Cup/Challenge, etc.; '06 ~ '15: 991.1 Cup; Ferrari 430/458 Challenge, etc. GT3 GTM GTM3 IMSA GT ~ 1975 - 1984 FIA Gr 5/IMSA '75 - '84 GTX (Turbocharged), AAGT (All-American GT): ; GM Monza, Camaro, Corvette, etc. AAGT H H5 FIA Gr 4/IMSA/Trans-Am '75 ~ '84, GTO over 3.0L: Porsche 911, 914, 934; Camaro, Corvette; , etc. GTO H H6 *Current Pro/Am Racing Entries (Post 2015) *Current Trans-Am TA1/TA2, SCCA GT1, post '15: Corvette; Camaro; Mustang; Dodge, etc. 9X GTM GTMX *Current GT LM/D/E, GT3/TA3 post '15: Porsche 991.2/992 Cup/RS/RSR, Huracan, Ferrari 488, Corvette C7-R, Ford GT, Audi R8, BMW M6 9X GTM GTMX Other unspecified cars running in group but not eligible for awards, points or podium 9X GTM GTMX *Note-1: Post 2015 cars may run but will not be eligible for points or podium (HSR Five Year Rule) Note-2: Listed cars are for example only; several models are eligible in more than one class based on rule restrictions and specifications, etc.

Grp 10 Modern Era GTS2 / GT3 / GT3 Cup / GT4 / Production Challenge Series Class Enduro E-class IMSA GTS2/FIA GT2; '85 ~ '98: Porsche 911/964/993 RS/RSR, etc. GTS2 H H6 GT3A: Porsche 996 R/RS/RSR; 996/997.2 Cup (3.8); Corvette C5-R; Ferrari 360GTC; GTE; Ginetta G55, etc. GT3/A GTM GTM4 GT3B: Porsche 993 R/RS/RSR; 996/997.1 Cup (3.6); Ferrari 360Ch; Ginetta G50, etc. GT3/B GTM GTM5 GT3C: Porsche 993 Cup; Cayman-S (3.4); BMW M3/E46 (3.4L); Viper (gen I/II); V6 Cup, Exige-S; Ferrari 348; Panoz GTS, etc. GT3/C GTM GTM6 *Modern FIA GT4: Cayman GT4; Lotus 2-11, Evora; Ginetta 5; BMW M3/GT4; Camaro GT4; Ford GT4, etc. GT4 GTM GTM4 GT5: Porsche 964 Cup; Boxster (2.7/3.2); Ferrari 348/355; Panoz GTS, Panoz RA/WC; BMW M3/E36 (3.2), etc. GT5 GTM GTM6 Street Tuner A: Street Stock cars with limited modification including aero enhancements by application and individual acceptance ST/A GTM GTM5 Other unspecified cars running in group but not eligible for awards, points or podium 10X GTM GTMX *Note-1: Post 2015 cars may run but will not be eligible for points or podium (HSR Five Year Rule)

Grp 11 Modern Era Track Day Cars / Sports Racers Class Enduro E-class Modern Sports Racers (over ~ 2.0L): Radical; Lola; Caterham; Praga, Swift, KTM X-Bow, etc. MSR/1 P P6 Modern Sports Racers (under 2.0L): Radical; Shelby CanAm; Stohr; Noble; Ultima; Barras; Wolf, etc MSR/2 H H3 *Note: Post 2015 cars may run but will not be eligible for points or podium (HSR Five Year Rule) 11X P/H PX/HX Unlimited Specials (accepted by application) UNL P P6