Coming from a guy that has owned three E36 M3s, I would say buy the RX-8 for pure track use. I've driven both, but only tracked the E36. That said, the RX-8 is one heck of a nimble and
agile car. Out of the box, I think it *feels* more athletic and handles slightly better than the E36. It's only downside is the lack of torque but if you can keep the revs up, it will play with the M3 all day. I ...