A good start would be the corsa catback, with a nice set of QTP LY headers and their Random Tech Y pipe That'll be my setup......emmmmm I can just hear it now The Corsa system can be purchased anywhere, the QTP system can be purchased at www.quicktimeperformance.com

A few other neat things you can get for performance would be a lid, filter, ported TB, fast toys ram air from www.fasttoys.net , LCAs.

If your looking for looks too, check out a nice set of Z06 rims or TT2 rims, both come in pretty big sizes
Also lowering springs and a good set of shocks will make your car handle nicely. Eibach, DMS are nice choices for springs, Bilsteins are cool shocks. Witht hat you'll need an adjustable panhard rod, and relocation brackets......

And while your doing all this, you might as well contemplate a 409 stroker kit

 

y pipe will make it a lil deeper