Gatlin Mufflers 4" Clamp On5" Clamp on Gatlin Mufflers are Designed to push on over 4" exhaust tip out let. 16" O/A length, 12" muffler section. 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)