hmmmmm....good question. I'll probably leave it as-is until the first winter. I could see doing headers if they aren't too much of a pain to install (or too expensive). When spin-tech makes a cat-back system (love those mufflers), I'll get that (w/ high-flow cats). There's a 'vette dyno tuner 20 minutes away, so I'll get a dyno tune. Other than that, I'll wait and see what bolt-on's come out and what works.
After a couple of years I could see getting a little bored with it...so heads/cams sooner or later, maybe different rear gears. It's going to be the best handling car I've ever owned, so I'll probably leave the suspension stock.