Has anyone fitted an aftermarket PDC system to the Z4 or indeed a BMW? I know it has been discussed a few times on the forum with a few manufacturers and comments flown around but I am intrigued if there is a way to integrate the aftermarket system into the car and use BMW wiring etc? I know CJ has mentioned that the cars come pre-wired and its a case of plugging in sensors or something similar? Is it as simple as that or what is required?