Pete,


I fully agree with Pé.


Not mentioning quality, the bolt-on, wrap-around mufflers vibrate badly and are prone to cracking as a result.

The dedicated MVVS exhaust system hangs on the engine, at its front end and the rear end is mounted to the airframe.

The MVVS 45 cc and all 58 cc engines perform best (by a lot), with an exhaust system that was designed for them.

Only the #3204 (with either the 3202/B, or #3202/P header) fits this description.

MVVS also makes the #3202/I header for the JMB 80, but there is no reason to prefer it over the original MVVS set.