You'd be suprised, although I don't know much about the RX8 drivetrain, but the old RX7(FD last gen) drvetrains are very stout, I've seen plenty(first hand) running stock trannies and difs putting down over 600whp...
But either way make sure your car is ok and isn't being recalled...
But either way make sure your car is ok and isn't being recalled...