Car Classes


Stock 2 Wheel Drive – S2
Stock All Wheel Drive – S4

1. All Cars must be equipped as from the manufacturer, with only factory installed and port-installed option packages. Options that were only part of a package must be present with the entire package. Complete option packages may be installed after purchase of the vehicle.
2. Tires must be DOT approved. Tires marked “For competition only”, “Not for street use” or similar, are not allowed. No part of the tire may be modified or altered from its original form, either through addition or subtraction, other than normal wear. No studded tires are permitted at National events unless ice or snow is present ; Regional and Divisional events may allow studded tires any time. Studded tires may not be homemade using bolts or 28 screws. Only street-legal studs are allowed. Tires may not interfere with any parts of the car (fenders, fender liners, suspension, etc).
3. Any air filter may be used, but it must fit in the stock location.
4. The additions of protective equipment are allowed with the following exceptions:
a. The modifications must only provide protection to the car and/or occupants and provide no performance advantage.
b. Mud flaps must be flexible.
c. Skid plates protecting suspension and drive-train components may only be made out of metal, composite materials or plastic derivatives.
d. Driver restraints and roll cage may be added.
e. Additional or replacement hood and trunk latches are permitted. All latch systems must be secure.
5. Dress – up and convenience items which do not give a performance advantage, reduce the weight of the car, or weigh less than the replaced standard part they are replacing are allowed (i.e. shift knobs, pedal covers).
6. ABS and/or traction control systems may be electronically/electrically disabled but not removed.
7. Vehicle lights may be replaced with alternate bulbs and housing. Auxiliary lights may be added. The total number of lights shall not be less than standard.
8. Any brake pads may be used.
9. Fuel may be any type of unleaded, E85, or diesel/biodiesel fuel commonly available at the pump. Alternative fuels will not be allowed.
10. Any clutch disc or pressure plate may be used provided it fits all the other unmodified, stock components.
11. Exhaust systems from the catalytic converter back may be removed or replaced with the following requirements:
a. The exhaust must exit to the rear of the driver.
b. The exhaust must comply with local noise restrictions
12. Any type wheel may be used provided it complies with the following: Wheels must be of the same diameter and width as the OEM wheel. Wheel offset (backspace) must be within 0.394″(10mm) of original equipment wheel offset.
13. Shocks/dampers may be replaced with unmodified OEM or unmodified, mass – produced aftermarket replacement units intended by the manufacturer for the specific year , make and model used. Rebuilds are allowed but only if the shock/damper is rebuilt to its original specifications (i.e. no re-valving). The stock spring must be used as it was on the OEM unit. The spring perch must be factory welded to the damper or use the exact attachment method and position as OEM. Adjustable dampers are only allowed if the OEM unit was adjustable and must retain the same number of adjustments or fewer as OEM. Remote reservoir shocks are only allowed if they are exact OEM units.
14. The front sway bar may be added, replaced or removed. A replacement front sway bar may serve no other purpose than originally intended by the vehicle manufacturer. In the case where the front sway bar is also a suspension locating link, stock geometry and methods of attachment must be maintained.
15. Any wheel alignment settings may be used provided the settings can be accomplished within the unmodified adjustment range as delivered from the factory. Any alignment techniques allowed by the factory service manual from the vehicle manufacturer may also be used.
16. Aftermarket replacement batteries are allowed provided they are the same group size and location as originally equipped.
17. Spare tires, tools, jacks, and any related covers may be removed.
18. Audio system components may be replaced with alternate components intended for the application (i.e. factory head unit may be replaced with aftermarket single din head unit)


Prepared 2 Wheel Drive – P2
Prepared All Wheel Drive – P4

1. All Rally Stock category modifications are allowed.
2. Any sway bars and their mounting may be used or removed.
3. Any brakes may be used.
4. Exhaust systems from the cylinder head exhaust ports back may be replaced with any material with the following requirements:
a. The exhaust must exit to the rear of the driver.
b. The exhaust must comply with local noise restrictions.
c. Functional catalytic converter(s) are required on vehicles equipped with catalytic converter(s) as original equipment. Any high flow catalytic converter(s) are allowed. Multiple catalytic converters may be replaced by a single unit. The inlet of the single replacement converter may be 30 located no further downstream than 6″ along the piping flow path from the original exit of the final OE converter. Vehicles not equipped with a catalytic converter as original equipment are not required to have one.
5. The intake system upstream from the throttle body may be replaced with any material. Forced induction components cannot be changed or added (turbochargers, superchargers, intercoolers). Turbocharger boost regulation systems, either electronic or mechanical, may be modified or replaced.
6. Short shift kits are allowed.
7. Front and/or rear strut tower bars are permitted.
8. Any dampers may be used. Damper attachment points on the body/frame/subframe/chassis/suspension member may not be altered. This installation may incorporate an alternate upper spring perch/seat and/or mounting block (bearing mount). No damper may be capable of adjustment while the car is in motion, unless fitted as original equipment. MacPherson strut equipped cars may substitute struts, and/or may use any insert. This does not allow unauthorized changes in suspension geometry or changes in attachment points (e.g., affecting the position of the lower ball joint or spindle). Threaded collars and camber plates are allowed.
a. Camber kits, also known as camber compensators, may be installed. These kits consist of either adjustable length arms or arm mounts (including ball joints) that provide a lateral adjustment to the effective length of a control arm. Alignment outside the factory specifications is allowed. The following restrictions apply:
1. On double/unequal arm (e.g. wishbone, multi-link) suspensions, only the upper arms OR lower arms may be modified or replaced, but not both. Non-integral longitudinal arms that primarily control fore/aft-wheel movement (e.g. trailing arm(s) or link(s) of a multi-link suspension) may not be replaced, changed, or modified.
2. On arm-and-strut (MacPherson) suspensions, Adjustable camber plates may be installed at the top of the strut and the original upper mounting holes may be slotted. The drilling of holes in order to perform the installation is permitted. The center clearance hole may not be modified. Any type of bearing or bushing may be used in the adjustable camber plate attachment to the strut. The installation may incorporate an alternate upper spring erch/seat and/or mounting block (bearing mount).
3. On swing or trailing arm suspensions, the main arms may not be modified or replaced, but lateral locating links/arms may be modified or replaced.
4. The replacement arms or mounts must attach to the original standard mounting points. All bushings may not be moved or relocated on the arm, except as incidental to the camber 31 adjustment. The knuckle/bearing housing/spindle assembly cannot be modified or replaced.
b. Springs may be replaced, but they must be of the same type and use original mounting points.
9. Electronic engine controls may be modified or piggybacked, but not replaced.
10. Any tire is allowed except home built-studded tires.
11. Any front seat may be used, provided the seating surface is fully upholstered. This does not permit the substitution of a passenger’s seat with a child or miniature seat of any type. Any substituted passenger’s seat must be sufficiently large and strong to be capable of adequately accommodating an adult, such that it could be used as the driver ’s seat. Cars may have no fewer than the original number of seats. Seat belts are required in all cars; however; the number of attachment points may not be less than originally equipped. Installation of shoulder and lap belts is strongly recommended. Additional belts must be installed per the belt manufacturer’s recommendations.
12. Any non-metallic bushing, including any suspension, steering rack, engine, transmission, differential, and body/frame mount bushing, is allowed but the replacement must be non-metallic and attach to the original factory location without modification.
13. Wheels are unrestricted.
14. On carburetor – equipped cars, any bolt on intake manifold or carburetor may be used. Any air filter system and associated parts may also be used.
15. Vehicles may substitute one differential with a mechanically governed limited slip or locking unit of an alternate type. This includes spools and welded stock differentials. This does not allow the use of a differential with external controls (electronic or otherwise) to regulate slip or locking. Differentials must be contained in a stock unmodified housing/third member with stock or optional ring and pinion ratios available for the specific model, body, and year of the vehicle only. 4wd vehicles may not substitute more than one differential with an alternate type.
16. Batteries may be substituted with any type. Relocation of the battery or batteries within the engine compartment or trunk area/luggage compartment behind the rearmost seats is permitted. Longer battery cables may be substituted to permit relocation and holes may be drilled to accommodate mounting of the battery and cables.
17. Accessory drive pulleys and belts may be replaced.
18. Any clutch disc, flywheel or pressure plate may be used.
19. On automatic transmission vehicles, any torque converter may be used.
20. Addition of rear wings and hood scoops/vents is allowed provided that either 1) it is a production part which is standard or optional equipment of a US model of the vehicle or 2) it is listed in the vehicle manufacturer’s US accessory catalog for that vehicle for normal highway use. Parts must be installed as directed by the manufacturer. Exact replicas (including weight) from alternate sources are also permitted.
21. Engine cooling radiators may be replaced with alternate parts subject to the
following restrictions:
a. Radiator core dimensions (width, height, thickness) must be no smaller than the standard part.
b. Radiator must mount to OE radiator mounts.
c. Fluid capacity and dry weight of the radiator must be no less than that of the standard part. Installation of an alternate radiator may serve no other purpose (e.g. to allow a cold air intake passage). In addition, the engine fan and fan shroud (unless it serves another purpose, e.g., as an alternator/generator mount) may be removed, modified or replaced. Electrically driven fans are allowed.
22. Oil cooling radiators for engine, transmission, or differentials; may be added, modified, or replaced with alternate parts providing they and their installation serve no other purpose, and subject to the following restrictions:
a. Fluid capacity and dry weight of any radiator being modified or replaced must be no less than that of the OEM standard part.
b. Radiator(s) and their lines must be securely mounted, reside in the engine bay area, or the general location of the OEM part being replaced or modified. No lines may be routed through the passenger compartment.
c. No body parts or structure may be altered in any way, except for the minimum holes to facilitate mounting brackets and fluid lines, for installation.
23. For vehicles not originally equipped with steering wheel airbags, alternate steering wheels and their attachment mechanisms are allowed.


Modified 2 Wheel Drive – M2
Modified All Wheel Drive – M4

1. All Rally Prepared category modifications are allowed.
2. Any Electronic engine controls may be used.
3. All non-essential components may be removed, replaced or relocated for the purpose of weight reduction or balance with the following requirements:
a. The shape of the body must remain recognizable as that of the manufacturer’s make and model.
b. The body must be made of a fire resistant material.
c. Structural strength of the vehicle may not be reduced or compromised.
d. Doors, hoods, trunk lids, sunroofs, hatchbacks, etc. need not function as originally designed. Bumpers, grilles, lights and trim may be removed. Side mirrors and tail/stop lights are not required.
e. Side and rear windows may be removed or replaced with Lexan or equivalent. Windshield may be replaced with Lexan or equivalent with addition of a full roll cage built to SCCA Improved Touring specifications or better.
f. The interior comp onents may be completely removed and/or replaced. Any edges created by these modifications that the driver or passenger may contact must be properly insulated to prevent injury.
g. Roof panels must be metal of at least the same thickness as original. Sunroof panels may be replaced with sheet metal of at least the same thickness as an original roof skin without sunroof. Inner roof structure may only be modified with addition of a full roll cage built to SCCA Improved Touring specifications or better.
4. Any eligible (per 6.1) log booked race car or car currently legal for stage rally competition in other sanctioning bodies may run in its appropriate Rally Modified class regardless of whether it meets the Rally Modified rules.
5. Any engine may be used but must be internal combustion.
6. Any drive train may be used
7. Any suspension may be used. This allows changes to all components and geometry.
8. Additional chassis braces and seam welding are permitted.
9. Any fuel system may be used provided gasoline, E85 or diesel fuel is used. Any NON-STOCK fuel cell, filter or pump located in the passenger compartment must be shielded by a metal bulkhead. Any fuel lines running through the passenger compartment must be of metal or metal braided construction.
10. Exhaust systems may be replaced with any material with the following requirements:
a. The exhaust must exit to the rear of the driver.
b. The exhaust must comply with local noise restrictions.
c. No catalytic converter is required.


X1/X2/X3 – This class will be for non street production 4 wheeled vehicles. i.e. razors, baja buggies, etc..

1. Window nets and/or arm restraints will be required.