I don't get it. You've got one of the fastest cars out there right now. I would invest the money in driving events. We had a bunch of Z06s this past weekend at Homestead and no one complained about lack of power.
If you can come off the banking and hit the infield course at 120 mph without touching the brakes you're good. The Z06 crowd didn't have a lack of power. If anything it was a lack of bravery. The things are just so damn fast it's scary.
Chin Motorsports has about 10 different events a year in Florida. Take the car to Sebring and then make a decision about more power.
The only problem I see with the Z06 is the street rubber that comes on the car. Get some Kumho 710s on the car and it will be much better - meaning faster.
Richard Newton
Wheel and Tire Performance Handbook
Corvette C5 Performance Projects: 1997-2004