Thread: what is this??
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      12-08-2012, 01:27 AM   #8
Drives: 2007 335i Coupe (Space grey)
Join Date: Oct 2011
Location: Toronto

Posts: 1,218
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i have these as well.. only notice slight difference at highway speeds. put these on when i tuned my car and also put in a high flow drop in filter. noticed a lot more dirt in the air box after installing this. so i guess it is directing more air into the air box at higher speeds. i would say they would probably start having an effect at ~70 mph
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