If you're after speed, a turbo or supercharger is your best bet. All the bolt ons (CAI, exhaust, headers, throttle body,etc.) in the world won't get you near the kind of power that forces induction will. With that said turbos and blowers aren't cheap, expect to spend several thousand dollars. Figure around $2500-$3500 for a turbo kit or supercharger, another grand to install it, and another couple hundred for a dyno tune (absolutely necessary). The results will be impressive (compared to a stock V6) your car should be about as fast as a full bolt on GT, maybe even quicker.
cold air , pulley, tuner, short throw shifter, throttle body, traction loc differential, with 410 gears , and if your looking for a more power i would suggest a power adder. ati procharger make a great supercharger that comes with an intercooler and it's self lubricated. there's also vortech and i believe paxton makes one as well. check out
brothers performance they have have some good prices on most of that stuff.