Will I be ok to run 13" Cobra/Bullit/Mach brakes on my car with my AFS 17x9 bullitts in front and 17x10.5 DD bullits in back (i know the back rotors are much smaller so that shouldn't be a problem)?
17" is the smallest wheel you can run witht the Cobra 13" brake upgrade so you will be fine. I have the 13" Cobra brakes with the same size rim configuration you have.