Most of the computer chip companies promise around 25 rear hp gain with a chip. What is chip changing primarily on the stock truck to get the extra hp?

 

Fuel and timing curves are changed. So are the shift points. Ford was little on the conservative side do to the supercharger.

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99.5 Black Lighting
CD Changer,Tow Pack,Ford Bed Liner,2in drop Shackles ,Tinted Windows,4 Rear Stoplights
2000 Mustang GT
Convertible,Performance Red,Black Top,
Cobra R Wheels,BFG Tires, Bassani X Pipe, Flowmaster Mufflers / Stock tips , K+N filter with air silencer removed
FMS 4.10 gears