Thank You Dave!
I know that this is one of the best Exhaust systems you can get, I just found another link:
(its for 323ti because for 318ti is no longer available)
http://www.schmiedmann.de/3er_Reihe/...ite37.htm#5102 But this is also the 'Eisenmann'-Version, the Tuner Version from Sat (
http://www.sat-autosport.de/eintragung/ ) was more expensive...