Huh, clever idea with the flaps...
I first saw flaps on a VW rabbit back in 1980 on my Grandmother's GTI. I thought it was a cool idea then, and definitely something that stuck with me as a cool idea now (pun not really intended)
Yup, that's it. The ones on the BMW are plastic with a hinge, but rubber is a great choice. You can buy flaps from Spal. It's what we use on our shrouds.
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