Well, in my opinion the brakes on a 325 are very good compared to those on most other cars. You could argue that if you're doing track days, the 330's brakes would be better, but they're not track items either. Besides, would you really drive a convertible that hard anyway ? Look, you've got a really beautiful, comfortable and nice car that has enough power for swift overtaking. If you want a fast car, buy an M3 :)