Two things: (1) The other posts are right in that you really need a manual transmission if you're serious about street racing, and (2) unless you're willing to spend major $$$ to turn a 325i into something is was never really meant to be, go buy a Honda. You can satisfy that boy-racer hunger for a lot less money.
The 325i is engineered to handle like it is running on rails an do it at high speeds. And, it will cruise at 100+ until you get tired of driving that fast and will do it long after the typical street racer has coasted to a stop on the shoulder of the road. It was never engineered to compete with the stoplight-to-stoplight crowd.
As Richard Petty is credited with saying, "Speed is money. How fast do you want to go?"
