Thread: what is this??
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      12-08-2012, 01:36 AM   #9
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Drives: SGM E90 330xi
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2006 330XI  [3.75]
Originally Posted by abhishriv View Post
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
Thanks for the info, makes me think twice about them.

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