Larry Waterman
Owner: Larry Waterman Make: GMC Model: Sierra Engine: Duramax Year: 2005 State: IN I took off my performance muffler on my 2005 Duramax work stock truck and installed a Hushpower muffler. It raised my torque 33 lbs./ft., WOW! It did the same thing on an LBZ 2006 street diesel that I sponsor and it raised the torque 34 lbs./ft. and it also raised it 13 Horsepower! Check out the dyno sheet attached.