You can only fold the rear seats down and remove interior behind the front seats.I thought you could strip interiors anyway, depending on class.
Exactly, engines must stay standard, keep original induction and keep original internal dimensions.They are more in the way of helping the engine breathe better, modifying it would be internal, such as uprated cams, or having the engine bored out etc.
The purpose is to give a mostly level playing field, meaning money doesn't make you the winner. The Lombard RAC runs in this format, using all the old stages they used in the best era of rallying


Lol