Connects2 CT25BM09 BMW 3 4 5 Series 2003> Front Rear Door 10cm 4" Speaker Adapters
Connects2 CTSBM015.2 Steering Wheel Stalk Adapter for BMW 1 2 3 4 Series 2012>
Connects 2 CAN-Bus interface leads make it possible to update your existing factory head unit to a new model whilst still retaining use of your stalk/steering wheel audio controls.