pretty sure the adaptive M suspension just refers to the shocks not the springs. so you can have both as the 2 axle air is an add on feature that doesn't take away the M shocks. Springs are just springs (albeit may be firmer). I had M adaptive on my F15 and had air bags on the rear.
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'07 Yamaha R1 (sold)
'06 C55 AMG (sold)
‘?20 M5, MP Carbon Pro Spoiler, MP Carbon Diffuser, MP Black grille and gills, MP Carbon Mirrors, CF side sills, 789M w/ Ti studs, eventuri, Dinan X pipe
'14 X5 50i (wife’s now)
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