The Xforce’s 3 inches stainless steel with Varex muffler and Smartbox for the 15-20 S3 Sedan gives an exciting sound experience since the varex muffler allows you to change the tone of your exhaust system with just the press of a button. You can enjoy both worlds, May it be silent or racing deep tone of your exhaust. This features both muffler and resonator kit that allows you to control the sound of your 15-20 S3 Sedan.

The Smart Box is designed to work in conjunction with Varex mufflers, with smartphone control of exhaust volume achieved via a Bluetooth connection and an elegantly crafted smartphone app. Placing control at your fingertips, the app is decked out to deliver convenient and precise performance exhaust management.  

Varex muffler Technology:

XFORCE’s Varex muffler is the premium standard in exhaust muffler technology, delivering enhanced exhaust volume control.

Employing a patented* technology, Varex mufflers integrate both stock and performance muffler designs, with a sophisticated butterfly valve mechanism directing exhaust gas flow. From silent to sports mode, the adjustable valve provides various options, allowing for control over sound levels.

Be it lower sound levels suitable for an early morning suburban commute or a more robust sound opted for navigating open stretches of country road, Varex mufflers put you in control of exhaust volume.