new pads = new rotors? A rule?

[jmatta]

If you have base Box rotors, I think you're OK just to change pads, as the others have said. I wouldn't waste my time on having them turned, as new rotors are relatively inexpensive unless you feel pulsing indicating a warp. Box S has cross drilled; no turning, but look for spider cracks. The street is not hard on brakes at all and your factory rotors should give you long life. I prefer to change pads when they hit the halfway point, as they are cheap and a thicker pad keeps the heat out of the caliper.

NEVER mix pads on a track or DE car...the differences in grip will be exaggerated and the car will most likely be either off track or heading the wrong direction.