ahhh...ATI! I actually bought a ATI D-1SC Procharger for my C5 and with my 10:8:1 compression (Stage II Heads), my tuner was estimating close to 520 Rear Wheel Horspower (with 20% drivetrain loss, that would be close to 620 to the flywheel) with my Single Intercooler Setup. To handle the power, I even bought a FLP Level IV bulletproof tranny, Racetronix Fuel Pump, Bosch/SVO 42 lb Injectors, and NGK plugs . With 10:8 compression, I was somewhat skeptical my bottom end could handle the power and I never installed the SC or Tranny. I agree, the 7G is probably the weak link as it's not proven. The car will probably be only lightly modded (bolt on mods) as I would like to look for another sports car once the power itch comes back.

Here's a pic of my ATI SC that I took a pic on the S500.