Join Date: Aug 2005
Location: Diamondhead, MS
Go for the cheap/free things first. You can bypass the coolant to the throttle body(free), change to a 160 t-stat, air foil in the throttle body, K&N. Also depends on mileage if you need to change spark plugs/wires.
Then you can worry about headers and exhaust.
First you need to know what are your goals with the car?
FWIW, I ran firstname.lastname@example.org with K&N, 160 t-stat, SLP air foil, 4.10 gears, and a HPP+ to correct the speedo. That was with the stock GSC's back in '97 at MIR. I think I had 6K miles on it at that time.