I also upgraded to the GM performance brakes. Contemplating on selling my oem rotors, brakes pads, etc but a piece of me wants to hang on to them. I had so much issues with dealership installing these things from dragging brakes, to a much heavier feeling ride quality, much lower mpg and even much firmer steering. I figured if I have anymore issues with these gm brembos I'll just return back to stock. Have you noticed any change in ride quality at all?