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      01-15-2013, 05:34 PM   #3
roccob1123
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Drives: 2007 BMW 328xi Coupe
Join Date: Jan 2013
Location: CT

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Depends on what side skirts they are. Some you can put right over the existing factory side skirts. Others you have to remove factory and install the new one. There should be a DIY on the forum on how to remove the e90 side skirts.