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aFe "stage 2" cold air intake question

Discussion in 'E90/E91/E92/E93 (2006-2011)' started by kmoghadam, Mar 1, 2010.

    kmoghadam guest

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    I just installed an aFe cai for my e90 330xi. I was wondering if a droning sound/vibration is normal between 3600-4000 rpm? The intake sound sgreat for higher rpms, but just around the 3600-4000 rpm range it sounds kinda like a "fart can" exhaust, and i'm not sure i like that. Any suggestions? I've tried putting weather stripping around the heat shield, not sure what other options are available to reduve this minor vibration/droning sound.....any suggestions would be much obliged......

    thanks again in advance
    • Member


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    I'd say that goes with the territory. That, and no discernible difference in performance.
    • Member


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    I have a fart-can sort of noise as well at a limited part of the rpm range. I've got a K&N cone filter on there right now. I do believe it's what CR said, that it comes with the territory.

    sunbrn guest

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    That's why there is so much design into the stock airbox with all those odd shaped chambers and foam inserts.

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