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      02-06-2010, 05:20 AM   #2
eg3
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Drives: X6 35i
Join Date: Jul 2009
Location: Boston

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Adding just a filter to the existing intake box won't gain you anything significant since you won't be removing any significant restriction from the intake system. However, if you remove the box and use a K&N (or other brand) open cone filter, then you'll be gaining hp & mpg. Even with that, it won't be more than 10 hp and 1 mpg. I'm not saying it's not worth it though. I'd be getting an intake kit right away if there was one available
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