what an absolute blast! not really sure where on earth to start, but if u haven't attended an hpde, get on it! by far the best investment on improving/enhancing my driving experience while exploring what the m cars are all about.
my car's fully stock save for a zeckhausen cdv (did not really need this either since gear changes were at a minimum on this tightly wound, curvy road track), and performed admirably considering the total of 4 22-minute sessions i ran. my instructor was very direct and owns a z3m roadster himself, so was familiar with bmw m cars and their performance pedigree.
i blasted past all the big and heavy camaros (10 showed up from the san antonio based camaro5 club) with ease indeed.
just a few pictures, too many to resize and upload! didn't manage to get in car video (no secure attachment for my point-and-shoot).