The motor on the back of it slides the clamshell looking things (the intake runners) to make them shorter or longer to tune the engine (based primarily on RPM, if I recall correctly). I'll try to post some material about it later this evening.
Black 2007 Alpina B7
Tension strut bushings
White 2007 Alpina B7
Supercharger clutch/bearings, replaced exhaust valve/pulled head, sunroof seal, 6000K angel eyes
Black 2002 BMW 745Li (sold)
KW v3's, blue angel eyes, 8000K headlights & HID fogs, rebuilt alternator & mounting bracket gasket, sunroof seal, CCVs, plugs, sway bar bushings, timing & valve cover gaskets, valve stem seals, guibo joint, mechatronic sealing sleeve, trans fluid, sanded headlights...