A TUNED 582 muffler (bolt on) brings the Rotax 582 from 65 to 80 hp! The 503 (dual carb) TUNED muffler brings the 503 from 52 to 62 hp. The price is only $425 plus shipping.

Note: These mufflers are a lot QUIETER than the stock Rotax mufflers. They are engineered for Destinys. (same shape approx)
However, they may fit many other applications.

PS -- The 503 Destiny is $1,600 CHEAPER than the 582 and with the new muffler... it puts out close to the SAME power!!!!