Offset rims, tires or spacers. These are permitted provided no modification to the vehicle, other than increasing the stud or wheel bolt length, is required by their use. Any resulting increase in track width may not exceed 1 inch.
Up to 1750 cc displacement is permitted for 356's and 912's.
Substitute DME Prom "chips" programmed in any manner, except for those affecting turbo boost, are permitted.
Tires and Wheels - In Production classes, wheels must be the same diameter as available from the factory for the model range. All tires must be Department of Transportation (DOT) certified and must not rub against any surface of the vehicle during driving event runs. Tire aspect ratio and width are free but must fit within the stock fender wells.
The use of non-standard material suspension bushings is permitted. Turbo tie-rod ends are allowed. Spherical bearings may be used in sway bar links. Upper front strut mount assemblies may be replaced with bolt-in aftermarket assemblies incorporating spherical bearings so long as they do not permit camber/caster adjustment beyond the stock range.
In 914 2.0 cars, the use of 94mm non-U.S. OEM pistons and cylinders is permitted.
The battery may be located anywhere in the vehicle except inside the passenger compartment.
Any steering wheel may be used.
Any spoiler may be fitted.
On a 356, any rear camber compensating device may be used, and a 911 hydropneumatic suspension may be removed. One-piece rear suspension spring plates may be replaced with adjustable plates of the same length.
Ignition System: Any modification is allowed, provided a mechanical distributor is used which fires the same number of spark plugs as the original distributor fired.
Air Cleaner: Any type of air cleaner or air cleaner housing may be used. The air cleaner and air cleaner housing may be removed.
Carburetors: Any vehicle originally carbureted may have any carburetor, provided the throttle body and venturi dimensions are not changed from original specifications.
Fitting or relocating an electric fuel pump is permitted.
RMR/AMR Event Rules – 2008Page 14