Gatlin Mufflers 5" Flange Mount5" X 12" Long Flange mount Gatlin Mufflers are 4" exhaust hose hookup, 6" flange 3 bolt pattern. The ultimate in high performance mufflers. Designed for big horsepower motors. All Gatlin mufflers are stainless steel, highly polished. Our unique perforated 7 tubes with stainless steel wool packing will calm even the wildest beast.(SOLD IN PAIRS)