Sportsman XR-1 Round 3in In/Out x 15in Muffler RHO Dinan also incorporates a Helmholtz

Dinan also incorporates a Helmholtz chamber design that reduces resonance or'drone' at low RPM

but it will also look the part as well

While box and filter enlargement and redesign are a major factor in ultimately producing a more potent intake they are not the only variables in creating a more efficient design either

Exhaust System - Sport - Cat-Back - 3 in Diameter - Dual Rear Exit - Dual 4 in Polished Tips - Stainless - Natural - 6

but at a cost

Sportsman XR-1 Round 3in In/Out x 15in Muffler RHO Dinan also incorporates a HelmholtzMuffler XR 1 Sportsman 3 in Center Inlet 3 in Center Outlet 15 x 5 in Round Body 20 in Long Stainless Natural Universal Each