reprogramming your computer

Hey guys,
I need some advice. I'm building a 99 GT to take to the track for driving schools. We run at VIR on a road course. I'm new to the Mustangs, I've been an old school Chevy guy until now. My question is what to buy to re-program my computer for a full race application to get the most out of the 4.6 on race day? I intend to run race gas. I would like to flash it back to a more stock configuration for minor street use ( premium fuel ). I know that there are units out there that you can adjust everything with, I just don't know anything about them or how they work. Any and all advice will be appreciated.

The car has a cold air kit with a K&N filter, X-pipe with flowmaster and no cat's. It seems to run stronger than other stock mustangs I've driven, but I don't know the mod's the PO did to it.

Ben

Thanks blubullett,

There is a dyno shop down the road, but they specalize in chevy's. I will drop by and talk with them. I wouldn't know what to do with the tuner anyway. I might as take it to the experts. Plus, with the dyno they can maximize my tune. My buddy has his vette there right now and they are putting a chip in. They said it may take two or three tries to get it right. Apparently, they send the chip back with the dyno sheets to the supplier to re-calibrate until they maximize the results.