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      11-15-2012, 03:55 AM   #2
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Drives: E92 335i
Join Date: Aug 2010
Location: Lockport/Chicago, IL

Posts: 4,901
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I always thought OEM bumpers were made from ABS plastic.

However I can tell you that polypropylene is a great alternative. My front bumper as well as my sideskirts are both made out of it and I couldn't be happier after dealing with so many fiberglass parts over the years. Avoid fiberglass, it cracks easily because it's so rigid. Polypropylene feels like OEM and it's sturdy, strong, and flexible.
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