Replace Air Filter On New 325i With K&n? - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 09-29-2004, 09:06 PM
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Brand new 2004 325i. Anyone feel it would be beneficial to replace the OEM air filter with a high flow air filter from K&N?

Thanks.
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#2 (permalink) Old 09-30-2004, 07:48 PM
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Probably would help with throttle response a little. Much more noticable if you put an intake in there, lots of ppl go for the Gruppe M at rennsport.com for their bimmers. That is a very expensive intake, others use ECIS and stuff. You can always get a gruppe m look a like off ebay, no real point in spending an extra 500 on name recognition.

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#3 (permalink) Old 10-01-2004, 08:16 AM
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The K+N air filter is a nice little, inexpensive mod that will add some extra kick, like KillFox said. I installed one on my 328 and am happy with it. It's enough of a difference so you can actually notice the extra power, especially low end.

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#4 (permalink) Old 12-02-2009, 07:07 PM
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I just put this filter in my 325xi. I can feel the difference. I still need sometime to be able to provide you some numbers.
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#5 (permalink) Old 12-30-2009, 08:56 PM
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Agree with all the previous...I have one in my 323i...plus the added bonus of better filtration over paper filters.
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#6 (permalink) Old 01-01-2010, 10:12 AM
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I also had one on my 530-2002 & I’ve noticed a little difference at the beginning only.

I purchased spray & oil but I don’t know how to use them.
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