Quite a few haha, I have a showroom thread with all the detail here:
But in a nutshell, Full Birds B1 suspension kit with Quaife LSD, M3 front control arms, camber pin mod, bmw performance short shifter, Simota carbon intake, MILVs and tune, supersprint backbox, 135i brakes, BBS wheels, and a bunch of 1M style interior bits. Spent WAY too much money on it all haha but oh well, I always enjoy driving it!