THis is a Bison Pitts Style muffler that is made specifically for the O.S. Max 55AX 2-stroke engine.
Please Note, this is not a Pitts Style Muffler for an O.S..40/.46... there is a difference. This muffler was manufactured specifically for the O.S. 55 and it allows the 55 to run at it's maximum performance.
It has less than an hour of use and is in as-new condition. The price is $30