Quote:
Originally Posted by emesdub
The M6 diffuser will not fit non-M (M-sport or standard) bumpers. You'll need to get the 650 M-Sport diffuser if you want to run quad tips on your 640 M-Sport.
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I am pretty sure the M6 diffuser fits any Msport rear bumper, 650 or 640. It will not fit if you do not have the m sport package though.