Basically the idea is that, when you buy the KW DDC ECU coilover kit, you get a free app for your iPhone that allows you to configure the dampers to 'comfort', 'sport' and 'sport+' modes with a swipe of your finger, and to lower the ride height between 5mm and 35mm.
There's also a more advanced mode that allows the user to make more complicated adjustments.
So, iPhone-adjustable suspension: brilliant gadgetry or unnecessary gimmickry?
