Check it out..The world 1st controllable sound sports exhaust, The Varex muffler by Xforce.

Varex muffler combines both the design technology 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 produces maximum power with a robust sound level (or the “sports car note”) and near-zero resistance. Whilst for lower sound level, the exhaust flows are directed through the chambered path (similar design with the stock muffler), and produces minimum sound level that gives you the best in-car comfort. Also, you are able to control the angle of the valve which can be adjusted to stop at any point between the sports mode and the silence mode. This gives you further freedom to set the optimal sound level according to your preference.

Most importantly, VAREX muffler is precisely engineered to ensure that when the Race Mode is switched on, it functions as a complete straight-through performance muffler with minimum back pressure. It maintain maximum power output during Race Mode.

Here's how it works:



Pretty cool muffler..i hope the muffler shops out there looking at this..

[Source:XForce]