Remark Sports Touring Triple Tip Cat Back + Front Pipe ExhaustOur unique layout was designed with a purpose. The outer pipes are 2" OD, and we intentionally incorporated a long tube length, as well as small canisters to aide in sound control when the exhaust valve is closed. When the 3" valve is open (controlled by OE exhaust valve motor), the exhaust flow is channeled to a straight 3" pipe with only a small, straight through design, muffler. This gives a low restriction and high flow path for exhaust gases