http://www.peachparts.com/shopforum/showthread.php?t=170431 Group buy on lowering springs. Post in there and make sure whoever is running it knows you're interested. Other than that, best thing you can do is renew all your rubber bushings, maybe get some decent speed rated tires. Get some HD bilsteins since you don't care much about ride quality.
Not much aftermarket support for these cars, just not much interest.