Yes, you use the stock belt. I installed the Steeda pulleys 2 months ago and really like them. The car pulls harder above 3500 RPM, especially in 4th gear.
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2004 Torch Red GT
Flowmaster Am.Thunder cat back, SLP Mid Pipe
Steeda Underdrive pulleys
3.73 gears
Diablosport Predator tune
Grille Delete and Mach 1 spoiler
Rear Wing delete 
Mustang Tuning Shifter
Bullitt Handling Kit
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