Originally Posted by Hib Halverson
Keep in mind that while the C5 brakes are an improvement over C4, from a tracking perspective, it won't be by much. You may find that after all that work and cost of installing the C5 brake discs and calipers, you didn't gain much brake performance, especially if your tracking involves long runs. Also, on C5 brakes, the only difference between a C5 and a C5 Z06 brake is red caliper paint and, if they have OE brake pads, more aggressive front pads.
If you're a serious trackrat with your ZR1, I'd be looking for something a bit more substantial in the front. It may cost more but the return on investment will be greater. You, also, need to add front brake ducts.
As for drilled/slotted rotors, today, drilled rotors are just for looks. The vast majority of modern brake pads do not have trouble with outgassing, which drilled rotors were invented to address. Also, all those holes decrease the brake disc's heat sinking and, unless the drilling is done right, they also can cause cracking. Slotted rotors are a better choice.
Lastly, in re: your second post, about finding a leak in the system. Before I'd sink time and money in to a C5 brake upgrade, I'd bleed the system, stick '96 GS front calipers on the car (a bolt-on), add some brake ducts in front and go track test.
Depending on how you are on brakes during tracking, you could find just having no leaks, GS calipers and better front brake cooling is adequate enough for the tracking you do.
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