GSE Performance Polaris Scrambler 850 1000 Trail Tamer Exhaust OUR MUFFLERS INCREASE POWER AND SOUND GREAT! NO FUEL CONTROLLER NEEDED THIS IS A FULLY BAFFLED MUFFLER / NO PACKING TO BURN OUT SO THEY WILL LAST FOR YEARS AND THE SOUND WONT CHANGE. WE DO A LOT OF TESTING WITH OUR MUFFLERS TO INSURE A GREAT SOUND AND STILL MAKE GOOD POWER OUR MUFFLERS MAKE IMPRESSIVE GAINS AND GREATLY IMPROVE THROTTLE RESPONSE FEEL THE POWER  ENJOY THE SOUND !!!