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      05-22-2012, 06:57 PM   #3
X6DB
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Drives: 2024 M4 Comp xDrive
Join Date: May 2010
Location: Albuquerque, NM

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Here are a few screen grabs of the M Sport package from the 2013 ordering guide. I think it may be the difference in tires that explains the top speed limiter difference. xDrive: all-season tires, RWD: performance tires. Maybe it's a tire speed rating thing. I don't plan on taking the car much above 130 anyhow, but it still sucks!

650i xDrive


650i RWD
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