Unless you are racing daily with your car or are towing trailers down long mountain roads daily, do yourself and the new rotors a favor and get rid of the metalmasters and replace then with the "Deluxe" pads. The meatlmasters are too harsh and have too much metal. They do not work when cold, require more pedal pressure to work well, and they will eat rotors. The Deluxe pads work well, are not so abusive to the rotors, and will work much better when not fully heated up. They are also relatively dustless, resist fade well for all except extreme racing conditions, and for the most part are not prone to squealing, though I recommend using the silicone brake grease on the backing plates and shims.