per the SCCA:
SCCA RallyCross events are open to all closed-top production based automobiles that are capable of passing a simple technical inspection. The vehicles are classed by drive train, modifications allowed, and in some cases power. The SCCA’s guidelines for vehicle classification are as follows:
Rally Stock
This category is for cars that are nearly stock with very few upgrade allowances. A cat-back exhaust and the replacement of consumable items, such as tires and brake pads with street legal replacements, are allowed. The category is further broken down into:
SR Rally Stock Rear Wheel Drive
SF Rally Stock Front Wheel Drive
SA Rally Stock All Wheel Drive
Rally Prepared
Rally Prepared is the category above Rally Stock. All Rally Stock modifications are allowed with the addition of more modification allowances to the suspension as well as the intake and exhaust. Any type and size of wheels and tires are allowed in this category. Rally Prepared is broken down further into:
PR Rally Prepared Rear Wheel Drive
PF Rally Prepared Front Wheel Drive
PA Rally Prepared All Wheel Drive
Rally Modified
This category covers all vehicles not in the other two. Modifications are fairly unrestricted, allowing for any suspension (including any changes in suspension geometry) and the use of any internal combustion engine. Any log booked race car falls under this category. With these allowances this open class is the most competitive class in RallyCross. The category is divided into:
M2 Rally Modified Two Wheel Drive
M4 Rally Modified All Wheel Drive
This is something I'd like to try out. Even better, I think I would be fairly competitive in full blown rally as well. Anyone looking to let me drive your car in any type of rally event, please PM me. I'll be holding my breath for those PMs (jk)!