C6 wheels and tires
 

Have increased HP on my 05 C6 and wanted to upgrade the size of tires on the rear. I am looking to put 305s on the rear on the 19 rims, however, I am concerned about the tires rubbing the fenders, as well as the affect said increase would have on the ABS and Traction Control. Has anyone every done this and if so please advise.