If you don't want to buy a new computer, this is the easiest way to change your settings on your PROM. Get the chip adapter from TPI Parts. You can change everything from your injector size and fan temp, to your transmission type. It can disable VATS and also EGR and SMOG. The only thing it won't change is your fuel map tables. This adapter offers NO perfomance gain. But it is great for other stuff.

http://stores.ebay.com/tpiparts