The patented VAREX Muffler application by XFORCE is an exhaust revolution - it allows you to be in control of how YOU want your car to sound. Our company is heavily involved in research and development, which gives XFORCE the cutting edge when it comes to performance exhaust manufacturing. You're In Control with VAREX! VAREX mufflers use our 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. Street Mode Setting your VAREX muffler in ‘Street mode’ enables lower sound levels and maximum discretion, as exhaust gases are directed through a chambered path as would a ‘stock’ muffler. In Between As the angle of the valve is adjustable, it can be adjusted to stop at various points between sports mode and silence mode. This gives you further freedom to set the optimal sound level according to your desired preference. Race Mode For greater power output and sound level, exhaust gases are directed through the opening path and produce maximum power with a robust sound level (or the ‘sports car’ note) and near-zero resistance. *Graphics are for illustration purposes only, actual product may vary