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I did. 18x10.5 C5Z Speedlines. I didn't go the all the way and run 305 on all 4 though. I ran 285 in front. I wanted to test fit them I just never did. Many guys have and say it works fine. That really gives you flexibility.
Please excuse the stupid question, but what do you do about the TPMS sensors?
I absolutely use TPMS. I also have a Trackside TPMS tool ($125). I bought the sensors (~$200) from Bob at House of Wheels when I bought the rims. Whenever I change wheels I merely reset the car to read the new sensors. It's just the right way to do it I feel and no problems on the track. In the big picture it cost around $300 but it's the cleanest way and you don't have to worry about any computer issues. BTW, used TPMS's and adjusting tools can be found used almost all the time to save some good change!
I did not know that. I ran base C6 brackets and rotors with my Z51 calipers but I did it to save the Z51 rotors and never realized the wheels wouldn't clear the Z51 brakes. Good advice!