Rally Stock

  • SAAll wheel drive
  • SFFront wheel drive
  • SRRear wheel drive

Rally Prepared

  • PAAll wheel drive
  • PFFront wheel drive
  • PRRear wheel drive

Rally Modified

  • MAAll wheel drive
  • MFFront wheel drive
  • MRRear wheel drive

Other

  • TRKRTruck Rear Wheel Drive
  • TRKATruck All Wheel Drive
  • UTVUtility Task Vehicle / Side by Side
  • Any eligible 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 Modified class rules.
  • All other vehicles will be assigned to either the Stock, Prepared, or Modified class within their drivetrain based on the allowance of changes that have been carried out as outlined in the following table.
  • Any Class with less than 2 drivers will not have awards.

A vehicle begins in the Stock class when new and progresses to the Prepared and then Modified classes as changes are made. For each change listed in the first column, the columns labelled Stock, Prepared, and Modified indicate whether the given change is allowed in that class. If a change is not listed then it is to be assumed that that change is not allowed in any class.

1

Options/Parts

Stock Prep Mod
A. Complete OEM options packages added or removed
Packages offered by the factory at the time of ordering
YES YES YES
B. Individual OEM line item options added or removed
Items offered individually by the factory at the time of ordering
YES YES YES
C. Any part replaced with any new unmodified OEM or unmodified mass‐produced aftermarket replacement part intended by the manufacturer for the specific year, make and model of vehicle YES YES YES
D. Any part replaced with any rebuilt OEM or mass‐produced aftermarket part intended by the manufacturer for the specific year, make and model of vehicle rebuilt to exact OEM specifications YES YES YES

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2

Safety

Stock Prep Mod
A. Roll cages and roll hoops added
A full roll cage built to SCCA Improved Touring specifications or better is recommended
YES YES YES
B. Driver restraints and harness bars added
The number of attachment points may not be less than originally equipped and all items must be installed per the manufacturer’s recommendations.
YES YES YES
C. Interior components modified to the minimum extent necessary for the proper installation of allowed safety equipment YES YES YES

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3

Protection

Stock Prep Mod
A. Mud flaps made from flexible materials added YES YES YES
B. Skid plates protecting suspension and drivetrain components made out of metal, composite materials or plastic derivatives added or replacing non-metallic OEM panels YES YES YES
C. Strut tower reinforcement plates that mount outside of the strut tower top with no chassis rigidity elements added YES YES YES

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4

Interior

Stock Prep Mod
A. Cosmetic and convenience items which do not give a performance advantage or weigh less than the standard part they are replacing added
(Shift knobs, pedal covers, in-car entertainment)
YES YES YES
B. Spare tires, tools, jacks, and any related covers removed YES YES YES
C. Driver’s seat replaced with a full-sized and fully upholstered seat YES YES YES
D. Front passenger’s seat replaced with a full-sized and fully upholstered seat YES YES YES
E. Rear passenger’s seat(s) removed NO YES YES
F. Interior panels, trim, and carpeting behind the B-pillar removed or modified NO YES YES
G. Front passenger’s seat removed NO NO YES
H. Interior panels, trim, and carpeting from the B-pillar forward removed or modified providing that any edges created by the modifications that the driver or passenger may contact must be properly insulated to prevent injury NO NO YES

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5

Body

Stock Prep Mod
A. Structural bumper beams and related mounting hardware and components removed or modified NO NO YES
B. Additional hood and trunk latches added YES YES YES
C. Non-metallic front bumper cover and any attached splitters/spoilers removed for the event provided that there are no exposed fluid containers below the crash bar YES YES YES
D. Rear wings, hood scoops/vents, and other dress-up items listed in the vehicle manufacturer’s US accessory catalog for that vehicle for normal highway use added and installed as directed by the manufacturer YES YES YES
E. Non-metallic fender/wheel well liners modified, removed, or replaced with any non-metallic design/material. Ground-‐facing non-metallic shields beneath the engine compartment may be modified or removed, provided they are forward of the passenger compartment NO YES YES
F. Non-metallic ground-facing shields beneath the engine compartment that are forward of the passenger compartment and not integrally molded to the front bumper or valance modified, removed, or replaced with any non-metallic design/material. NO YES YES
G. Non-essential body panels, grilles, side mirrors, and trim pieces removed, modified, relocated, or replaced with panels of any design or fire resistant material for the purpose of weight reduction or balance providing that the shape of the body remains recognizable as that of the manufacturer’s make and model, and the structural strength of the vehicle is not reduced or compromised
Doors, hoods, trunk lids, sunroofs, hatchbacks, etc., need not function as originally designed; however, the driver door and passenger doors (if a passenger seat is present) must maintain sufficient functionality to allow safe ingress/egress
NO NO YES
H. Front side windows replaced with safety nets NO NO YES
I. Windshields removed or replaced with Lexan or equivalent NO NO YES
J. Rear side and rear windows in non-convertibles removed or replaced with safety nets, Lexan or equivalent NO NO YES
K. Roof panels and sunroof panels replaced with metal of at least the same thickness as original roof skin. NO NO YES

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6

Electrical/Lighting

Stock Prep Mod
A. Battery or batteries added or substituted with any type or size NO YES YES
B. Battery or batteries relocated within the engine compartment or trunk area/luggage compartment behind the rearmost seats. Longer battery cables may be substituted to permit relocation and holes may be drilled to accommodate mounting of the battery and cables NO YES YES
C. Longer battery cables added and holes drilled to the minimum extent necessary to accommodate the proper installation of allowed relocated battery or batteries NO YES YES
D. Vehicle lights replaced with alternate bulbs and housings YES YES YES
E. Auxiliary lights and their power and control systems added YES YES YES
F. Non-optional OEM lights removed NO NO YES

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7

Engine

Stock Prep Mod
A. Alcohol fuels NO NO NO
B. Nitrous oxide systems NO NO NO
C. Electric power plant motors, controllers, components, and wiring modified or replaced NO NO NO
D. Any type of unleaded, E85, or diesel/biodiesel fuel commonly available at fuel stations YES YES YES
E. Fuel cell, fuel filter, or fuel pumps replaced with any commercially marketed items of any design/material provided that any elements located in the passenger compartment are shielded by a metal bulkhead and any fuel lines running through the passenger compartment are of metal or metal braided construction NO NO YES
F. Air filter replaced with aftermarket units that fit into the stock air box YES YES YES
G. Intake system upstream from the throttle body replaced with any design/material NO YES YES
H. On carburetor-equipped cars, carburetor, intake manifold, and air filter system and associated parts replaced with any design/material.
This does not allow for fuel injection to be added.
NO YES YES
I. Exhaust systems that do not exit to the rear of the driver NO NO NO
J. Exhaust systems that do not comply with local noise restrictions NO NO NO
K. Exhaust system from the catalytic converter back removed or replaced YES YES YES
L. Exhaust systems from the cylinder head exhaust ports back replaced with any design/material NO YES YES
M. Catalytic converters removed NO NO NO
N. Multiple catalytic converters replaced with one functional unit NO YES YES
O. Catalytic converter(s) replaced with functional high-flow model(s) NO YES YES
P. Forced induction boost regulation systems, either electronic or mechanical, modified, replaced, or reprogrammed NO YES YES
Q. Forced induction components added, modified, or replaced with alternate designs/materials
(Turbochargers, superchargers, and their hoses and piping)
NO NO YES
R. Electronic engine controls modified, piggybacked, or reprogrammed NO YES YES
S. Electronic engine controls replaced NO NO YES
T. Accessory drive pulleys and belts removed or replaced with any design/material NO YES YES
U. Engine cooling radiators replaced with alternate items where the radiator core dimensions (width, height, thickness) are no smaller than the standard part that mount to OEM radiator mounts and have a fluid capacity and dry weight 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).
NO YES YES
V. Engine fan and fan shroud (unless it serves another purpose, e.g., as an alternator/generator mount) removed, modified or replaced NO YES YES
W. Electrically driven fans added NO YES YES
X. Oil cooling radiators for engine, transmission, or differentials added, modified, or replaced with any design/material that serve no other purpose and have a fluid capacity and dry weight no less than that of the standard part
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 and no lines may be routed through the passenger compartment.
NO YES YES
Y. Body parts or structure altered to the minimum extent necessary to accommodate the proper installation of allowed cooling radiators NO YES YES
Z. Internal combustion engine replaced with another internal combustion engine of any design NO NO YES

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8

Drivetrain

Stock Prep Mod
A. Clutch disc and/or pressure plate replaced with a unit that fits all the other unmodified, stock components YES YES YES
B. Clutch disc and/or pressure plate replaced with any design/material NO YES YES
C. Automatic transmission torque converter replaced with any design/material. NO YES YES
D. Shifting levers and bushings modified or replaced with alternate designs/materials NO YES YES
E. One differential replaced with a mechanically governed limited slip or locking unit of an alternate type.
This includes spools and welded stock differentials. 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.
NO YES YES
F. External manual or electronic to regulate slip or locking of any differential(s) added NO NO YES
G. Any or all drivetrain component(s) modified or replaced with any design/material NO NO YES

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9

Electronic Systems

Stock Prep Mod
A. Tire pressure monitoring systems disabled, sending units removed, or signals altered YES YES YES
B. Antilock braking systems disabled YES YES YES
C. Electronic traction control systems disabled YES YES YES
D. Antilock braking systems removed NO YES YES
E. Electronic traction control systems removed NO YES YES

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10

Chassis

Stock Prep Mod
A. One rear trailer hitch/receiver that serves no other purpose added
Complete or partial removal of the hitch is allowed for competition provided it does not result in a reduction in weight compared to the unmodified standard configuration
YES YES YES
B. Frame rails, brackets, and cosmetic components modified to the minimum extent necessary for the proper installation of allowed rear trailer hitch/receiver YES YES YES
C. Front strut tower bracing bars added, removed, modified, or replaced with alternate designs/materials NO YES YES
D. Rear strut tower bracing bars added, removed, modified, or replaced with alternate designs/materials NO YES YES
E. Non-metallic bushings, including any suspension, steering rack, engine, transmission, differential, and body/frame mount bushings replaced with non-metallic bushings of any material that attach to the original factory location without modification NO YES YES
F. Chassis reinforcement bracing added NO NO YES
G. Chassis seam welding performed NO NO YES

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11

Suspension/Steering

Stock Prep Mod
A. Wheel alignment settings that can be accomplished within the unmodified adjustment range as delivered from the factory using alignment techniques described by the factory service manual YES YES YES
B. Wheel alignment settings outside of the OEM adjustment range NO YES YES
C. Front sway bar added, removed, disabled, or replaced with any aftermarket unit
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.
YES YES YES
D. Rear sway bar added, removed, disabled, or replaced with any design/material NO YES YES
E. Shocks/dampers/struts replaced with mass‐produced aftermarket units intended by the manufacturer for the specific year, make and model of vehicle that have less adjustments than the OEM units YES YES YES
F. Shocks/dampers/struts rebuilt with non-OEM valving, fluid weights, or strut inserts NO YES YES
G. Shocks/dampers replaced with aftermarket units with remote reservoirs where the OEM units did not have them NO YES YES
H. Shocks/dampers replaced with any design/material
The installation may incorporate an alternate upper spring perch/seat and/or mounting block (bearing mount).
NO YES YES
I. Springs replaced with alternate designs/materials NO YES YES
J. Springs mounted in a manner different than OEM NO YES YES
K. Spring perches modified or replaced with a non-OEM design
Includes threaded collars and alternate upper spring perch/seat and/or mounting block/bearing mounts.
NO YES YES
L. Damper attachment points on the body/frame/sub frame/chassis/suspension member modified NO NO YES
M. Camber plates and crash bolts added, removed, disabled, or replaced with any design/material NO YES YES
N. Upper mounting holes MacPherson struts slotted and holes added to the minimum extent necessary for the proper installation of allowed camber plates NO YES YES
O. Center clearance holes for MacPherson struts modified NO NO YES
P. Camber kits, also known as camber compensators 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.
NO YES YES
Q. MacPherson strut modified to or replaced with struts that change the suspension geometry or attachment points (e.g., affecting the position of the lower ball joint or spindle) NO NO YES
R. Shock/damper adjustment system capable of adjustment while the car is in motion added NO NO YES
S. Non-integral longitudinal arms that primarily control fore/aft wheel movement (e.g. trailing arm(s) or link(s) of a multilink suspension) modified or replaced with alternate designs/materials NO NO YES
T. Lateral locating links/arms on swing or trailing arm suspensions modified or with alternate designs/materials
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 adjustment.
NO YES YES
U. Main arms on swing or trailing arm suspensions modified or replaced with alternate designs/materials NO NO YES
V. Knuckle/bearing housing/spindle assembly on swing or trailing arm suspensions modified or replaced with alternate designs/materials NO NO YES
W. Steering wheel and its attachment mechanisms replaced with any design/material NO YES YES
X. Any or all suspension component(s) modified or replaced with any design/material/geometry NO NO YES

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12

Wheels

Stock Prep Mod
A. Wheels that have been altered from their OEM state NO NO NO
B. Non-OEM wheel sizes used YES YES YES
C. Wheel spacers that use properly sized mounting hardware added YES YES YES
D. Lug bolts replaced with properly sized wheel studs YES YES YES
E. Lug bolts or lug nuts replaced with aftermarket items of any material YES YES YES

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13

Tires

Stock Prep Mod
A. Tires that contact any part of the car added
(fenders, fender liners, suspension, etc.)
NO NO NO
B. Home-built studs added to tires NO NO NO
C. Non-OEM tire sizes fitted YES YES YES
D. Inner tubes added to tires YES YES YES
E. Retread or recapped tires fitted YES YES YES
F. Tires not street legal in the USA fitted
Tires that are street legal in the USA will carry a valid TIN number that is registered with the NHTSA, not just a “DOT” stamp.
NO YES YES
G. Tires marked “For competition only”, “Not for street use” or similar fitted NO YES YES
H. Tires altered from their OEM state
Either through addition or subtraction, other than normal wear
NO YES YES

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