GSE Performance Polaris Sportsman 400 450 500 570 Performance Muffler + High Flow Air Filter This muffler does not fit the 500 X2 model THE 400, 450, 500 & 570 SPORTSMAN PULLS REAL STRONG WITH THIS MUFFLER ON IT WITH OUR NEW HIGH FLOW AIR FILTER ADDED YOU GAIN EVEN MORE POWER, PLUS YOU KEEP YOUR INTAKE CLEAN !! OUR MUFFLERS INCREASE POWER AND SOUND GREAT!