The exhaust from an early model WILL fit on the later model,provided that you convert it to the spigots that the earlier models use,as opposed to the push-in type that uses the little half moon spacers and clamp that bolts to the head holding them in place.It's an easy swap,because the spigots bolt right to the same holes in the head,the older pipes slip over the spigots,and tighten the round,finned clamp to hold them on.............................