BMP "BikeMan Performance Powder Lite Muffler The muffler that took the snowmobile industry by storm All BMP mufflers are developed on a Superflow Dyno Gauranteed to produce at least the same HP as stock In many cases a 2-3 HP gain is acheived Polaris 600 and Ski-Doo 1000 models see a 4-5 HP gain