Started this conversation on the cts-v brakes thread. Guess it's time to start my own. Quick synopsis I have one front rotor on the way from the dealer. Still working on finding part number for the caliper. This is going to be 15.5 in front carbon ceramic 2 piece rotor and rear 15.3 in 4 piston set up. This is going to be an expensive and time consuming process but i appreciate everyone's input. Went to the local parts store today and picked up some factory gtp rotors. I'm hoping to modify to create my own gtp hat section that will mate to the carbon ceramic disc ring. Once I have a working prototype I will be remachining using either stainless or aluminum. Another option I am looking at is modifying gtp wheel bearing hub assemblies to accommodate a 5x120 bolt pattern. Has anybody else had any success with this as a means of changing bolt patterns? Rotor should be here late next week. Pics coming soon!