Quote:
Originally Posted by tranquility
I'm guessing because it's inflatable/deflatable and it feels similar to my old massage chair...I mean, what else can it be if not air?
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While I can't confirm, I too believe that on the E89 the side-bolsters are air-filled for adjustment. On my Mercedes, the side bolsters are electronically controlled and the whole thing moves, but in the Z's case, it does appear to just inflate/deflate.