The engine management computer or ECU may be altered or replaced.

Last Updated: 1/6/18 Classes: WDCR-SCCA will class all participant vehicles in accordance with WDCR-SCCA TT Car Classing at the end of this document. Vehicle classes are representative. While every effort has been made to class those vehicles common to our TT program, not all vehicles may be included. This does not mean the car cannot participate; it will be classed at the event. The Time Trial Coordinator reserves the right to re-class any vehicle or vehicle/driver combo at any time in the spirit of promoting fun, safe competition. All classes are permitted the modifications listed in the table below with no change in class. If a modification is not listed below, it is not permitted. OEM Update/Backdate Engine Authorized Modifications OEM parts from any model in the same class or lower may be used. Engines are excluded from this authorization and are subject to the class bump described below. Air filter unrestricted. Air intake assembly may be replaced. The engine management computer or ECU may be altered or replaced. Any ignition system permitted. Batteries may be replaced and relocated. Manifolds and heads may be port and polished. Engine may be blueprinted and balanced. Engine may be bored a max of.040 over. Factory pistons and rods or aftermarket equivalent must be used. Plastic timing gears may be replaced. Carburetor jets or fuel injectors may be replaced. Oil pans, pan baffles, scrapers, windage trays, oil pickups, lines, and filters are unrestricted. Oil catch tanks are permitted. Relocated oil filters and coolers permitted. Alternate water pump, alternator, power steering, and crankshaft pulleys of any diameter or material may be used. Type of accessory drive shall remain as stock. Engine mounts free. Turbo and superchargers, if equipped, must remain stock. Associated hardware, including but not limited to downpipes, intercoolers, etc. may be replaced. For superchargers, all pulleys driving the supercharger must remain of stock diameter. Fuel System Emissions equipment may be removed. Any fuel pump and associated plumbing may be used. Fuel cells and associated plumbing may be used. Fuel cell must be in stock fuel tank location. Engine Exhaust Fuel must have an octane rating no higher than 93. Diesel vehicles may use any commonly available diesel fuel. Any exhaust header and exhaust system may be used. Exhaust shall exit behind the driver away from the car body. Catalytic converter may be replaced/removed. Engine Cooling Must meet event-specific sound limits. Any radiator may be used. Must be in stock location and not require chassis/body modification. Protective mesh screens may be mounted in front of the radiator and/or oil cooler(s) Transmission/Final Drive Air conditioning systems may be removed in whole or in part. Any clutch disc and pressure plate may be used; balancing of the flywheel/clutch/pressure plate assembly is permitted. OEM limited-slip or locked differentials are permitted. Any final drive ratio is permitted provided it fits the stock differential/transaxle housing without modification to the housing. Transmission mounts free. Chassis Ride Height Chassis Suspension Two-piece drive-shafts may be replaced with one-piece. 4, measured from the lowest piece of bodywork, unless stock is lower. Any shock absorber and spring may be used. Their number, perch locations, system of attachment,

attachment points must remain stock. Aftermarket coilovers approved for all factory coil spring equipped axles. External adjustments of shock control limited to two (2). Camber/caster plates, offset bushings, extended balljoints, or other bolt-on camber/caster modifications permitted. Any anti-roll bar(s), traction bar(s), panhard rod or watts linkage may be added, removed, or substituted. Bushing material, including that used to mount a suspension subframe to the chassis, is unrestricted. Brakes Aftermarket chassis stiffening devices are permitted. Brake calipers/pads/rotors/drums are unrestricted. ABS systems, if equipped, may be disabled. Aftermarket ABS systems are not permitted. Flexible rubber brake lines may be replaced with Teflon-lined, metal-braided hoses. Backing plates and dust shields may be ventilated or removed. Air ducts may be fitted to the brakes, provided that they extend in a forward direction only. Brake proportioning valves may be used. Wheels/Tires Parking brakes, mechanisms, and actuating components may be removed. Any size. Resulting tire fitment must be fully contained within the bodywork when viewed from above. Wheel spacers permitted. Any wheel studs, bolts, and nuts are permitted. Body Tires must be commercially available, DOT approved, and 100 treadwear or higher. OEM body panels may be modified but not replaced. Hood and trunk pins permitted. Fender flares permitted. Fenders may be rolled, trimmed, or pulled for tire fitment. Wheel-well liners may be removed. Glass windows may be removed, or replaced with polycarbonate. Vehicles equipped with a windshield must retain one of the same dimensions. Body side moldings, rocker panel moldings, and wheel opening trim pieces may be removed. Resulting holes may be filled. In addition to any OEM aero, one (1) additional significant aerodynamic device from the list below is permitted at the front and the rear of the car each, for a total of two (2) devices. Permitted significant aerodynamic devices: Front: Lip, spoiler, or vertical airdam extending no further than the lowest part of the wheel; canards (no more than two (2) per side); or splitter extending no more than 2 from outer edge of mounting surface. Rear: Wing (see rules below), spoiler, or diffuser (see rule below). Rear wings must be single element, mounted at or below the roof line, and not extend past 12 rearward of the bumper. Swan-neck wings are not permitted. Rear diffuser must be contained with the rear axle and rear-most edge of the bumper. Movable aerodynamic devices, unless OEM equipped, are not permitted. Flat, single-piece undertray extending from the leading edge of the bumper or any aerodynamic device to the front axles permitted. Flat bottoms, unless OEM equipped, are not permitted. Interior Ducting may be added for the purposes of cooling, cannot feed into any aerodynamic device. All interior pieces, with the exception of the dashboard, may be removed. Gauges are free. Driver and front passenger seats may be replaced to facilitate use with roll bar/cage and harnesses. Roll bar/roll cage and other related safety equipment permitted and encouraged. Any modification in excess of those permitted in the table result in a minimum bump of one class (+1), at the discretion of the Time Trial Coordinator.

Any tube chassis variant of a production vehicle results in a bump of two classes (+2). Engine swaps are classed at the class of the swapped engine plus a bump of one class (engine +1). Adding forced induction to a vehicle that did not originally come with forced induction results in a bump of classes (+2). Vehicles that have a forced induction model or trim of the same chassis, may equip that OEM forced induction unit [subject to forced induction rules in the modification table] and be classed at the level of that model (i.e. Mini Cooper equipped with the supercharger from a Mini Cooper S would be bumped to the S class, rather than +2. Use of an aftermarket supercharger, even at the same power level, would be subject to the +2 bump). Classing Examples: Example 1: 1989 BMW 325i with coilovers, sway bars, race seats, harness bar running Toyo RA-1 tires on 17x7 Kosei wheels is TT4. Example 2: Take that same car from Example 1; add higher lift cams and the car becomes TT3. Example 3: Take that same car from Example 1; replace the motor with one from an E46 M3 (TT2) and it is now classed at TT1. Example 4: Take the car in Example 1; add a supercharger and it is now TT2. Class Crosswalk The following table shows a crosswalk between common club racing and time trial classes used by other organizations. Vehicles with a current competition year logbook may run in their crosstalk class without making any modifications. Any change from logbook configuration will result in TT classing taking effect. Changes may have been made for parity. All car classing is subject to approval of the Time Trial Coordinator, and can be changed at any time in the spirit of promoting fun, safe competition. TT SCCA EMRA NASA WRL TTX T1, STO STGT, ST1 ST1, AIX, ST, SU, GTSU GTO TT1 T2, AS, STU ST2 ST2, AI, SpecE46, H1, GTS5 GP1 TT2 T3, ITR, STL ST3 ST3, ST4, PTD, SpecE36, H2, GP2 GTS4 TT3 T4, ITS, SM ST4 ST5, PTE, SpecE30, H4, GTS3 GP3 TT4 ITA, SSM ST5 ST6, PTF, GTS2 GP4 TT5 ITB, B-Spec, ITC ST6, ST7, ST8 GTS1 Scoring Scoring will be two-fold, by class and overall. By Class: Any class with 2 or more participants each earning more than 100 points will run for its own championship. Finishing order will be determined by raw time. Championship points will be awarded per the table below. Overall: Overall finishing order will be determined by raw times with PAX modifiers applied. See PAX formula sheet for current class PAX values. Championship points will be awarded per the table below. Drivers competing in multiple classes during the season will have each classes championship points counted separately, with the highest scoring class being counted as their official championship position. Finishing Points Finishing Points Finishing Points Finishing Points Finishing Points Position Position Position Position Position 1 30 5 17 9 9 13 3 17 0 2 26 6 15 10 7 14 2 18 0 3 23 7 13 11 5 15 1 19 0 4 20 8 11 12 4 16 0 20 0

Points of Interest PAX will be used for overall scoring. This is the only practical way to accommodate having an overall championship. We will use the PAX based on actual times introduced in 2015. Overall Scoring and Class Scoring will be maintained separately. Example: the fastest TT2 car may place 1 st in TT2 and 4 th Overall. They will receive 30 points towards the class championship and 20 towards the overall. THREE DROPS FOR 2018. Drops apply to overall championship only. Each day of competition is considered one event, so a usual PDX weekend has two events (Saturday and Sunday).

WDCR-SCCA TIME TRIAL VEHICLE CLASSINGS Note 1: Vehicle classes are representative. Not all vehicles are included in the lists below. For any vehicle not listed please contact the Time Trial Coordinator at the event. Note 2: The Time Trial Coordinator reserves the right to re-class any vehicle at any time in the spirit of promoting fun, safe, competition. CAR CLASSING BY MAKE Class Make Model Years TT5 Acura Integra 1985-1989 TT4 Acura Integra 1989-1993 TT3 Acura Integra 1993-2001 TT2 Acura Integra Type R All TT2 Acura NSX 1990-2005 TTX Acura NSX 2016+ TT4 Acura RSX All TT3 Acura RSX-S All TT4 Acura TSX All TT1 Alfa Romeo 4C All TTX Alfa Romeo 8C All TT2 Alfa Romeo Giulia All TT1 Alfa Romeo Giulia Quadrifoglio All TT4 Audi A3 All TT4 Audi A4 All TT4 Audi A5 All TT4 Audi A6 All TT4 Audi A7 All TTX Audi R8 All TT3 Audi S3/RS3 All TT2 Audi S4/RS4 All TT2 Audi S5/RS5 All TT2 Audi S6/RS6 All TT2 Audi S7/RS7 All TT3 Audi TT (4 Cylinder) All TT2 Audi TT (6 Cylinder) All TT1 Audi TT-RS All TT2 Audi TT-S All TT3 BMW 1 Series All

TT2 BMW 1M All TT3 BMW 2 Series All TT5 BMW 3 Series (E30) 1982-1994 TT4 BMW 3 Series (E36) 1990-1999 TT3 BMW 3 Series (E46) 1998-2006 TT3 BMW 3 Series (E92) 2005-2011 TT3 BMW 3/4 Series (F30) 2012+ TT6 BMW 5 Series (E28) 1981-1988 TT5 BMW 5 Series (E34) 1988-1996 TT4 BMW 5 Series (E39) 1995-2003 TT3 BMW 5 Series (E60) 2003-2010 TT3 BMW 6 Series 2011+ TT1 BMW i8 All TT2 BMW M2 All TT4 BMW M3 (E30) 1982-1994 TT3 BMW M3 (E36) 1990-1999 TT2 BMW M3 (E46) 1998-2006 TT1 BMW M3 (E92) 2005-2011 TT1 BMW M3/4 (F30) 2012+ TT3 BMW M5 (E39) 1995-2003 TT2 BMW M5 (E60) 2003-2010 TT2 BMW M6 2011+ TT3 BMW Z3 1995-2002 TT2 BMW Z3M 1995-2002 TT3 BMW Z4 2003+ TT2 BMW Z4M 2003+ TT3 Cadillac ATS All TT2 Cadillac ATS-V All TT3 Cadillac CTS All TT2 Cadillac CTS-V All TT3 Chevrolet Camaro (V6) 1993-2002 TT2 Chevrolet Camaro (V6) 2010+ TT2 Chevrolet Camaro (V8) 1993-2002 TT1 Chevrolet Camaro (V8) 2010+ TTX Chevrolet Camaro SS 1LE 2017+ TTX Chevrolet Camaro ZL1 All TT3 Chevrolet Cobalt All TT3 Chevrolet Cobalt SS (Non-Turbo) All TT2 Chevrolet Cobalt SS (Turbo) All TT3 Chevrolet Corvette (C4) 1984-1996 TT2 Chevrolet Corvette (C5) 1997-2004 TT1 Chevrolet Corvette (C6) 2005-2013 TT1 Chevrolet Corvette (C7) 2014+

TT2 Chevrolet Corvette Z06 (C5) 2001-2004 TT1 Chevrolet Corvette Z06 (C6) 2006-2013 TTX Chevrolet Corvette Z06 (C7) 2015+ TTX Chevrolet Corvette ZR1 (C6) 2009-2013 TT4 Chevrolet Cruze All TT4 Chevrolet Sonic All TT2 Chevrolet SS All TT4 Dodge Neon All TT3 Dodge Challenger (V6) 2008+ TT2 Dodge Challenger (V8) 2006+ TT1 Dodge Challenger Hellcat All TT3 Dodge Charger (V6) 2006+ TT2 Dodge Charger (V8) 2006+ TT1 Dodge Charger Hellcat All TT4 Dodge Dart 2013+ TT2 Dodge Neon SRT-4 All TT4 Dodge Stealth All TT1 Dodge Viper 1992-2010 TTX Dodge Viper 2013+ TT3 Fiat 124 Spyder All TT5 Fiat 500 2011+ TT4 Fiat 500 Abarth 2011+ TT4 Ford Fiesta All TT3 Ford Fiesta ST All TT4 Ford Focus All TT2 Ford Focus RS All TT3 Ford Focus ST All TT4 Ford Focus SVT All TTX Ford GT All TT3 Ford Mustang (I4 and V6) 1979-2004 TT2 Ford Mustang (V6) 2005+ TT2 Ford Mustang (V8) 1979-2004 TT1 Ford Mustang (V8) 2005+ TT1 Ford Mustang Boss 302 2012+ TT2 Ford Mustang Ecoboost All TTX Ford Mustang GT350 All TTX Ford Mustang GT500 2007-2014 TT4 Honda Accord (4 cylinder) All TT3 Honda Accord (6 cylinder) All TT3 Honda Civic Si All TT2 Honda Civic Type R All TT4 Honda Civic/del Sol 1984-1992 TT3 Honda Civic/del Sol 1993-2017+

TT4 Honda CRX All TT3 Honda CRX Si All TT5 Honda Fit All TT3 Honda Prelude 1992-2001 TT2 Honda S2000 All TT4 Hyundai Tiburon All TT5 Hyundai Accent All TT4 Hyundai Elantra All TT2 Hyundai Genesis Coupe All TT4 Hyundai Veloster All TT3 Hyundai Veloster Turbo All TT4 Infiniti G20 All TT2 Infiniti G35 All TT2 Infiniti G37 All TT2 Jaguar F-Type (4 cylinder) All TT1 Jaguar F-Type (6 cylinder) All TT1 Jaguar F-Type (8 cylinder) All TT2 Kia Stinger All TT2 Lexus IS All TT1 Lexus IS F All TTX Lexus LFA All TT1 Lexus RC All TT2 Lotus Elise All TT2 Lotus Evora All TT2 Lotus Exige 2004-2006 TT1 Lotus Exige 2007-2017+ TT3 Mazda 3 All TT2 Mazdaspeed 3 All TT4 Mazda Miata 1989-1993 TT3 Mazda Miata 1994-2017+ TT2 Mazdaspeed Miata 2004-2005 TT4 Mazda MX3 All TT4 Mazda Protégé All TT3 Mazdaspeed Protégé All TT4 Mazda RX-7 1978-1985 TT3 Mazda RX-7 1985-1992 TT2 Mazda RX-7 Turbo 1985-1992 TT2 Mazda RX-7 1992-1998 TT2 Mazda RX-8 All TT2 Maserati GranTurismo All TT2 Maserati Ghibli All TT2 Maserati Quattroporte All TTX Mercedes-Benz AMG GT All

TT4 Mercedes-Benz C 1994-2000 TT3 Mercedes-Benz C/CLA/CLS 2001-2017+ TT2 Mercedes-Benz C/CLA/CLS AMG 2001-2013 TT1 Mercedes-Benz C/CLA/CLS AMG 2014+ TT4 Mercedes-Benz E 1993-2002 TT3 Mercedes-Benz E 2003-2017+ TT2 Mercedes-Benz E63 AMG 2010+ TT3 Mercedes-Benz SLK/SLC All TT2 Mercedes-Benz SLK/SLC AMG All TT4 Mini Cooper/Clubman/Coupe 2001+ TT3 Mini Cooper/Clubman/Coupe S 2001+ TT3 Mitsubishi Lancer All TT2 Mitsubishi Lancer Evo All TT3 Mitsubishi 3000GT All TT3 Mitsubishi 3000GT VR4 All TT3 Mitsubishi Eclipse All TT2 Mitsubishi Eclipse GS-T/GSX All TT4 Mitsubishi Galant All TT3 Mitsubishi Galant VR4 All TT3 Nissan 240SX All TT3 Nissan 300ZX All TT2 Nissan 300ZX Turbo All TT2 Nissan 350Z All TT2 Nissan 370Z All TT4 Nissan Altima (4 cylinder) All TT3 Nissan Altima (6 cylinder) All TTX Nissan GT-R All TT3 Nissan Maxima 1999-2017+ TT5 Nissan Sentra 1982-1999 TT4 Nissan Sentra 2000-2017+ TT4 Nissan Sentra SE-R 1990-1995 TT3 Nissan Sentra SE-R/Spec V 2000-2012 TT5 Nissan Versa All TT3 Pontiac Fiero All TT3 Pontiac Firebird 1993-2002 TT2 Pontiac Trans Am 1993-2002 TT2 Pontiac G8 All TT3 Pontiac Solstice All TT2 Pontiac Solstice GXP All TT5 Porsche 914 All TT3 Porsche 911 1963-1988 TT2 Porsche 911 Carrera S/RS/SC 1963-1997 TT1 Porsche 911 1998-2017+

TTX Porsche 911 GT2/3 All TT1 Porsche 911 Turbo All TTX Porsche 918 All TT4 Porsche 924 All TT3 Porsche 924S All TT3 Porsche 944 All TT2 Porsche 944 Turbo All TT2 Porsche 944S2 All TT3 Porsche Boxster All TT2 Porsche Boxster S All TTX Porsche Carrera GT All TT3 Porsche Cayman All TT2 Porsche Cayman S/R All TT1 Porsche Cayman GT4 All TT2 Porsche Panamera All TT1 Porsche Panamera Turbo All TT3 Scion FRS All TT4 Scion TC All TT5 Scion XA/XB/XD All TT3 Subaru BRZ All TT4 Subaru Impreza All TT3 Subaru WRX All TT2 Subaru WRX STI All TT5 Subaru Legacy All TT4 Subaru Legacy GT All TT3 Toyota 86 All TT4 Toyota Celica ST/GT/GT-S 1985-1989 TT3 Toyota Celica 1990-2006 TT2 Toyota Celica Turbo All-Trac All TT5 Toyota Corolla 1983-1995 TT4 Toyota Corolla 1996-2000 TT3 Toyota Corolla 2001-2017+ TT4 Toyota Corolla (AE86) All TT3 Toyota Corolla XRS All TT3 Toyota MR-S All TT4 Toyota MR2 1984-1989 TT3 Toyota MR2 1989-1998 TT2 Toyota MR2 Turbo All TT4 Toyota Supra 1986-1993 TT3 Toyota Supra 1994-1998 TT3 Toyota Supra Turbo 1986-1993 TT2 Toyota Supra Turbo 1994-1998 TT4 Toyota Yaris All

TT6 Volkswagen Golf/Rabbit 1974-1983 TT4 Volkswagen Beetle All TT3 Volkswagen Beetle Turbo All TT4 Volkswagen Corrado All TT3 Volkswagen Corrado G60/VR6 All TT5 Volkswagen Golf/Rabbit 1984-1992 TT4 Volkswagen Golf/Rabbit 1993-2017+ TT5 Volkswagen GTI 1974-1983 TT4 Volkswagen GTI 1984-1994 TT3 Volkswagen GTI 1994-2017+ TT6 Volkswagen Jetta 1979-1983 TT5 Volkswagen Jetta 1984-1992 TT4 Volkswagen Jetta 1993-2017+ TT3 Volkswagen Jetta GLI All TT2 Volkswagen R32/R All TT5 Volkswagen Scirocco All TT5 Volvo 740/760/780 All TT4 Volvo 850/940/960 All TT3 Volvo C30 All TT3 Volvo S40/V40 All