No, their not directional. I guess that way GM only has to make a front and rear and not all 4 corners. I just wanted them for the "eye candy" factor anyway. KVR rotors would be a better bet for the track stars...
Can't say that I've noticed any sort of performace gain, but I never really have had to get on the brakes hard so I wouldn't know..ya know?
Got them from GM parts direct. The fronts (P/N 88964607) were $343 and the rears (P/N 88964608) were $294.
yummy... tasty six pot clamps, two-piece rotors, directional vanes, lov'n'it!
BTW: on the drilled ones, be sure to keep the holes clean. I can't remember the problem it causes (clogged holes) but it sounded really bad. Something to do with heat retention and stress fractures. Basically when the rotors are TOTALLY COLD - wash with some pressure, and if you have a compressor, blow them out. Brake cleaner wouldn't hurt annually during winter wheel changes.