Since you have not bought the car yet you may want to rethink the model year. The 2002-2003 was a major change to the fuel system and there are guys having issues providing enough fuel pressure to run above 550hp. The fuel system alone can cost needless big bucks. Just something to look into before buying.
Personally I like TTs and APS is coming out with a wicked system for the C5 in October. All slung down low like TTi and Lingenfelter but with great potential for power.
Another downer is the LS2 / LS6 are high compression engines and probably won't last long with more than 7#s boost. You'll be able to get to 600hp and anything beyond will probably damage the internals.
If you want to drag race the car then a centrifugal is the better option IMO. Boost and power build in a linear form to redline and unlike the TT won't peter out at 6000rpm. Turbos seem to have a sweet spot that they work best in. More torque down low but they don't carry it thru redline.
And one more thing to contemplate before buying a C5. The driveline is weak for drag racing. What you'll find is once you get 550 hp you'll need to beef up the diff and then the tranny and most certainly the clutch. Add all that into the mix and the F-body may be a better choice. If cash is no problem, dive right in.
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