Yellow Speed Racing Front 4 Piston Ultra Big Brake Kit - Smart Fortwo 2008-2014 (W451) fits_2012-2018`BMW`3 Series Mufflers come with a vacuum

Mufflers come with a vacuum control box and vacuum line allowing for an easy install

Vehicle Compatibility: 05-11 Mercedes B Class (W245)

Vacuum Actuated Exhaust Valves: Long-lasting design with precise sound control at the touch of a button

raising pitch and cleaning up the frequency content for a distinctly exotic signature

Yellow Speed Racing Front 4 Piston Ultra Big Brake Kit - Smart Fortwo 2008-2014 (W451) fits_2012-2018`BMW`3 Series Mufflers come with a vacuumYellow Speed Racings Ultra Series Big Brake Kit is designed for road and track use. This big brake kit features optimum braking performance, attractive looks, easy installation and a cost effective price. Factory brakes are designed primarily for daily driving on most applications. If you have added additional horsepower to your vehicle, or frequently compete in motorsports such as circuit racing, drifting, time attack or rally racing, then a big