I find this interesting.... I drove both the 50 and the M and actually found the M to be a better ride... I live in Houston and the streets SUCK here so "pothole comfort" was definitely a consideration.

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2013 X5 M
2010 GT3
RSS Bypass * EVOMSit Software*Lowered 5mm*Custom RSS 4-point Roll Bar*RSS Tarmac II Suspension
2011 750Li
2008 Cessna 400