In Perfection they use 335i's for the course and M Coupes for autocross.
Perfection is a much intensified version of Advance II - it is still aiming at developing techniques to deal with everyday emergency situations that drivers can encounter on the road. It is not a race training course and the autocross racing is straightly for fun at the end of the day, much like the slalom racing at the end of Advanced II. Given that, it makes more sense to do the formal part of the traning in an everyday road car.
Fascination is for track training, and I believe the entire session is done in M cars.
07 E93 335i - Returned at lease end
09 W211 E350 4Matic Avant Garde - Blk/Blk, AMG pkg w/18". Sport Susp. F1 Asym. Debadged.
09 MkV GTI w/Leather & 18" Huffs. F1 Asym
10 987.2 S w/Leather sport seat, Sport Chrono, 19" Carrera S II wheels