TowX --- Let me just say Sh-t happens, i have seen a friend S500 MB brake rotor(factory) split to where you could see the vanes in it. if you are not using the X for track and if its within parameters for the cars performance then go ahead, the same goes for CAI, exhaust, tires, carbon fiber hood spoilers ect. alot of us have spoilers on our cars but do we actually drive fast enough for it to affect the performance of our cars maybe not but we still have them. and some will say they actually feel the effect, haha, ok if you say so at 30 mph. lol. and so on and on. so drilled /slotted rotors if thats what you want then go for it. thats my 2cents.