| I have a 2000 model 323i saloon, what I have done so far regarding performance:
H&R coil over suspension
18" OZ Super Leggera
Bridgestone S-03 Pole Postion, 225/40 ZR18 (all four around)
AC Schnitzer racing front upper tie bar -strut brace
AC Schn. Sport rear upper strut brace
AC Schn. racing front and rear anti-roll bars (by Eibach)
Brembo Gran Turismo Braking system (F: entire corner assembly, approx 13.5 inch)
M3 custom made Front Spoiler
K&N drop in filter
Various other cosmetic applications
Now, I'm looking into exaust systems, I'm not sure whether to go for a cat-back exaust or also change out the exaust headers as well, I am also thinking about back pressure issues and also, possibly changing the front airbox, Super Sprint seems to have a nice application, still looking around though | 
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