Its never a good idea to mix new pads with old, shoddy rotors. If yours are still in workable condition, spend a few extra bucks and have them turned by a reputable machine shop. We stepped up to a set of SSBC’s new cross-drilled and slotted Big Bite rotors (#23046AA3L&R $126 ea.). We felt that using the forged-aluminum calipers with the old stock rotors would have been like wearing new dress shoes with a pair of grease-stained Dickies. That just wouldn’t fly. We prepped the new races (installed from the factory) with a liberal coat of high-temp disc brake wheel bearing grease.