On the 550 active side bolsters were optional on M-Sport cars as well (only on LCI cars and rarer than night vision, never seen one with them personally, but they are out there - somewhere).
Originally Posted by PimoX3
Only if you have the active ones (ie. you have an M5)!
Sure... had to rub it in for us non-M's
If your car came with active side bolsters there would be a button below the seat heating on the console to turn them on/off, also the adjusters are 2 little round buttons on the side of the seat.
[B]2008 550 - Carbon Black/Black - M-sport, Cold Weather, Premium, NAV, Comfort Access, Logic 7 (LOADED, every option except night vision)
Previous 3 cars (the 550 is my 38th car):
2005 530i - Prem, Sport, NAV
2006 Jeep SRT-8
2003 Infiniti G35 coupe