This Muffler flows 20% or more then stock, EPA compliant, constructed of stainless steel. Utilizing dual outlet options. Muffler allows for a free flowing great sounding system with options for compliant sound (SAE J1287 sound levels or below). With Forestry approved and replaceable spark arrestors, (SAE Standard J335). Optional quiet baffles to reduce sound below SAE J1287 as well (hunting, private trails, music lovers, etc).