Increase horsepower and torque with a deeper, more aggressive exhaust noteWelded from mild steel then bathed in a four-step chrome-plating process4" muffler body uses a cooling chamber with proprietary technology to prevent blueingTri-flow muffler begins as a 4" muffler at the front and morphs into a 4' x 5.75" oval at the rear

Emphasizes the six cylinders that power the classic Gold Wing engine6-into-2-into-6 slip-on mufflers each have three separate bodies on each side giving the bike six pipes total; each of the three muffler bodies measures 21/4" in diameter

Muffler body diameter 4 "(10 cm.).Soft and deep sound.