Many of those cars have cooling vanes.
Are your rotors drilled and slotted, or slotted only?
Mine are drilled.
Without the vanes, the brakes run hotter with the holes forward. The rotors also seem to wear faster with the holes forward. Since the wheels are usually turning when the brakes are being applied and there is significant brake dust, centrifical force usually expells the dust outward, where you want it to go. I do not get much dust in the centers of my wheels, but the outer edges get a lot. My rotors have the holes rearward, the same as the factory rotors were.
For slotted rotors, I would certainly orient the slot trailing, because the slots cause more problems, with the leading edge of the slot forward.
Note that I have found slotted rotors to be less effective than non-slotted rotors. Drilled rotors seemed to be the most effective.
