So I've had a chance to try to test-fit a Gen5 full stock exhaust (Cat-back) on a Gen4 and it didn't fit. It seems like the part that is different between bikes is the not so much the location where the manifold ends but rather the location of the bottom mounting point, which Cat bolts up to. That obviously doesn't really matter since nobody will be swapping stock exhausts between bikes but what is great is that aftermarket exhausts don't use that mounting point at all. This means that aftermarket exhausts should fit both bikes. This includes slip-ons and full systems. Has anyone tried it yet?