Gatlin Mufflers 4 1/2" Clamp On5" Clamp on Gatlin Mufflers are designed to push on over a 4 1/2" exhaust tip outlet. 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)