Searched everywhere for a substitute for the fairly expensive all aluminum Pitts Style muffler for my .91 ASP 2-stroker and found this well designed and much cheaper, albeit less attractive, muffler from Magnum. Slapped this puppy on my .90 Edge with my .91 ASP 2-stroke and it works great and at half the cost of a "brand name" Pitts!!!! Great job Magnum!