Big Barrel Oval Twin & Single Tip Muffler- Maximum power and miminum sound level Complete straight through internal design, minimize back pressure, maximize power output. Maximum sound damping material, effective reduce sound level. Direct bolt-on the most of Xforce turbo system: Introduces the worlds first remote controlled Sports muffler. All New mufflers are available now! What is VAREX? A pioneering remotely controllable exhaust muffler, which is able to vary the volume out-put range between the quieter near-stock muffler to the full robust tone of a performance exhaust.