I found this sight a long time ago with a Nitrous system installed in an SVT I forget if it was actually NOS. It was called the PUFF SVT. I am not sure if that would help you. But I do remember the car having something like 300 hp and very quick track times.

1998 SVT #95: Toreador Red - SHM headers,K&N Filter, Energy Suspension MM inserts, Cross Drilled Rotors,Redline Tranny Fluid, Custom Billet Aluminum Shift Knob