Originally Posted by bimsport
save the money for something else
I think the Shark Injector would be one of the first mod I would do, especially for a 323i/ci.
I have it on one of our E46's. It litterally bring the engine to life. Revs up to 7000rpm (awesome sound with a CAI by the way).
The throttle response is greatly improved.
If you are looking for pure horsepower, then you will be disappointed. If you want a more responsive/agressive engine, GO FOR IT.