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3-Series (E46, E90) Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d. is the premier BMW Forum on the internet. Registered Users do not see the above ads.
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Old 09-29-2004, 09:06 PM   #1 (permalink)
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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?

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Old 09-30-2004, 07:48 PM   #2 (permalink)
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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 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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Old 10-01-2004, 08:16 AM   #3 (permalink)
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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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Old 12-02-2009, 07:07 PM   #4 (permalink)
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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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Old 12-30-2009, 08:56 PM   #5 (permalink)
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Agree with all the previous...I have one in my the added bonus of better filtration over paper filters.
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Old 01-01-2010, 10:12 AM   #6 (permalink)
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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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