This small plug-and-play unit connects into the factory wiring harness and allows the driver full control of the exhaust valve whenever they want. For too long enthusiasts have had to pay too much for command of their exhaust. We solve that issue. These controllers connect to the vacuum solenoid in the trunk to provide the driver control over their exhaust flap. Before purchasing please ensure your car has a VACUUM style exhaust valve. These DO NOT fit on electronic valves. 100% REVERSABLE, ALWAYS ABLE TO RETURN TO STOCK AT ANY TIME In regards to fitment, many BMWs have the exhaust flap and our controller can be used. In the pictures below you will find the control unit. If your car has this, then this product will fit your car. BMW Fitments: (Consult description) 1 SeriesE82 / E88 (08-13) > 135i 3 SeriesE90 / E92 / E93 (07-13) > 335i5 SeriesE60 / E61 (04-10) > 545iE60 / E61 (04-10) > 550i 5 SeriesF10 / F11 (11-16) > 528iF10 / F11 (11-16) > 528i xDriveF10 / F11 (11-16) > 550iF10 / F11 (11-16) > 550i xDriveF10 / F11 (11-16) > M5 (2013-2016) 6 SeriesF12 / F13 (12-18) > 650iF12 / F13 (12-18) > 650i xDriveF12 / F13 (12-18) > M67 SeriesF01 / F02 (2009+) > 750LiF01 / F02 (2009+) > 750Li xDriveF01 / F02 (2009+) > 760Li X SeriesE70 X5 (07-13) > X5 ME70 X5 (07-13) > X5 xDrive35i X SeriesE71 X6 (08-14) > X6 ME71 X6 (08-14) > X6 xDrive35iE71 X6 (08-14) > X6 xDrive50i X SeriesE84 X1 (2013-2015) > X1 28iE84 X1 (2013-2015) > X1 28i xDriveE84 X1 (2013-2015) > X1 35i xDrive X SeriesF25 X3 (2011-2017) > X3 xDrive35i X SeriesF26 X4 (2015-2018) > X4 28i xDriveF26 X4 (2015-2018) > X4 35i xDrive Z SeriesE89 Z4 (2009-2016) > Z4 sDrive28iE89 Z4 (2009-2016) > Z4 sDrive35iE89 Z4 (2009-2016) > Z4 sDrive35is