2012 BMW 5 Series (f10 chassis) installed with a detachable Tow Trust tow bar and manufacturers approved 13pin caravan socket. This particular had an upgraded exhaust system with a modified lower rear bumper valance which needed to be trimmed accordingly. Standard M-Sport bumpers don't need any bumper trimming. The car will sense when it is towing and enable 'towing' features like bulb monitoring on trailer/caravan, auto rear pdc cut-off, auto rear fog light turn off, traction control adjust.
