clutch ?
To replace it you'll need to pull the transmission. If you search around there are some sites that'll walk you through it. I can pull one in my garage in about 3 hours after doing it a few times. If you need the car as a daily driver and you've never done it before I'd take it somewhere to have it done. The big manufacturers are Ram, Mcleod, Centerforce, Textralia, and Spec. Call their tech lines and do some shopping to see what's in your price range. Depending on what you're looking for you'll be balancing price, chatter, holding force, and warranty/service.
On my basically stock 2000 TA I threw on a Z06 clutch with a Fidanza flywheel and am happy with it so far. If you're making much over 350-400 hp and dragging the car I'd go with something more aggressive.

