The C6 Z06 brakes will provide more thermal mass with the larger rotors, and more rigid calipers, however your post begs the question why you're asking. Have you pushed your C5/LS1 brakes to their limits and beyond? If not, then I would say keep pushing. If you have, then either the C6 Z51 or Z06 brakes could be a good step in the right direction, with the Z51 being the more affordable option since you could reuse your current C5 caliper bodies and D731 pads.
Tobin
KORE3
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