Varex™ mufflers use patented technology to combine both the design of the stock muffler and the performance muffler into one single compact unit. A sophisticated butterfly valve mechanism is implemented to redirect the exhaust gas flow and vary between the two. For higher sound level, the exhaust flows are directed through the opening path and produce maximum power with a robust sound level (or the “sports car note”) and near-zero resistance. Hidden motor design 9.5" x 4″ x 14″ Body size Offset in/Center Out 3" Single Inlet, 3" Single Outlet Higher flow rate when valve is closed than the original Varex When valve is closed will reduce sound to a quieter sports sounding muffler Not recommended for Turbo vehicles