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Pads, and if you're going to be spending a ton of time on track calipers as well. Sway bars will make a big improvement, and shocks will make a big difference also. The Z06 shocks are valved really aggressively in high speed rebound, which can make the car feel skiddish on track.
If your spending a ton of time on track with race tires you may want to look at a camber kit as well... the camber kits for C5/C6's are less about extra adjustability and more about eliminating the factory alignment eccentric bolts which have a tendency to slip with track use and race tires.
You've got a fantastic car there, the Z06 is no joke in the right hands!
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