HMF Racing Yamaha Grizzly 550-700- Performance-Series Slip On 07-21The Yamaha Grizzly 700 exhaust systems are available in the HMF Performance, Titan, and Swamp (with snorkel) Series as a Slip On or Full System. The Performance Series picked up 5 horsepower and 4lb of torque. The Titan Swamp Series (Quiet or Loud) picked up 4 horsepower and 3lb of torque. At idle, the stock muffler is at 85dB, while the Performance Series is at 98dB, the Titan Swamp (Quiet) is at 86dB, and the Titan Swamp (Loud) is at 93dB. Tuning is