What to do with my M3

I just purchased a 1998 M3 with the 240hp engine. I wanted to know what improvements others have done to their E36 M3. I am also looking at tires. What works well for this M3? They currently have Bridgestone Potenza 730s. Thanks. ps. Improvements could be any, ie asthetic or engine, exhaust etc.

Look for Potenza S-03 Pole Positions. They're absolutely wonderful. My roommate has them on his '99 M3 and they work wonders for his car. His suspension is really fucked up though; he lowered it 2.2 inches on springs and shocks alone. Do NOT do that. It makes the ride rough, and on tight corners, the spring over-compress and rebound, sending the car into a nasty tank slapper.

The tires are terrific, though.