I've asked myself the same question. The brackets for the exhaust hangers do look to be facing the opposite way one one as opposed to the other, but I didn't pay too much attention otherwise, it could just be one is further up than the other.I've looked at a few photos of both bottom sides from both cars and they look almost identical. Just wondering as I can get an axle back for half the price of one made for a Z. Would also open up more options as to what's already been tested.