Leib Engineering CAN BUS Pro Exhaust Flap Valve Controller for the BMW G Series allows you to take control of your vehicle's exhaust system. Gain control over the exhaust valves and start/stop system. Plug & play installation takes approximately 120 minutes without the need for cutting or soldering. Main functions: EXHAUST VALVE FLAP CONTROL | Adjustable in modes: open - series - closed START STOP OFF | The engine start-stop function can be deactivated (can be set in the menu) User information: EXHAUST VALVE FLAP CONTROL | Controlled via rocker on the multifunction steering wheel RES Button on the multi-function steering wheel pressed shortly, stores the valve flap mode for the next engine start Optical confirmation of the selected valve flap mode by flashing the turn signal - only at the instrument cluster (not visible outside) All functions can be adjusted in the menu (instrument cluster) if required (please download the functional description online) Important information: There will be NO error entry by using the LEIB CAN EXHAUST module The LEIB CAN EXHAUST module is automatically DISABLED, if a BMW Tester is connected to the car To prevent a double function, the functions of the exhaust valve flap control are only operable if the cruise control and the limit function are off COMPATIBILITY All BMW G Series models with a twin-valve exhaust setup. This includes: - BMW G42 M240i- BMW G20 M340i- BMW G21 M340i- BMW G22 M440i- BMW G23 M440i- BMW F40 M135i xDrive- BMW F44 M235i xDrive & more If you're not sure whether this part fits your vehicle, please get in touch.