5″ 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)