Thread: Just picked up BMW Performance Rear Diffuser
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      07-03-2010, 02:24 AM   #7
leeadam
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Drives: F90 M5 Comp (Evolve Tune)
Join Date: Apr 2010
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Quote:
Originally Posted by scottishpete View Post
Why does it need trimmed?
Hi you just need to trim a sliver off a lip on the original undertray.
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