[L695speed]

Camarocrazy42, depends on which brakes you're talking about. I did the very same digging on brake upgrades. They need to be able to fit inside the wheels you want to use. But be aware, they all require some modifications to the spindles. I initially went about trying to get bigger brakes to fit inside my original 15 inchers. While someone got a set to fit under Turbofins I believe they were a pricey set. I wanted a cheap off the parts store shelf upgrade. There was hardly anything out there for 15 inch wheels. So I dug around and remembered the Formula wheels were 16x8 while resembling the original wheels. More options opened up. Could use LS1 F body fronts, different combination of rotors and calipers, etc.

Wound up going with LS1 F body fronts because they were cheap and plentiful. I found with the C4 12 inch brakes I would have had to find a caliper and have it rebuilt or rebuild it myself, and I didn't know if I would have found them with the carrier. I use rock auto and they didn't have any options for the drivers front caliper. Only rebuilds. No carriers. The 13 inch ZR1 brakes require 17 inch wheels. All will need a hub and spindle mods with a new bracket.

I believe people run C5 calipers on LS1 F body rotors. I didn't go that route because I found out about that later. Straight C5 brakes will need 17s. Here is a sticky over at TGO that is a good starting place. It gets confusing sometimes, but you can get a basic idea of what fits, what doesn't fit, etc. Its also a good example of not all wheels are created equal. Some 17s like the Ronals used on firehawks are not easily accepting of brake upgrades.