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      07-21-2019, 02:31 PM   #1
F32_435xi
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BMW engine air filter question

Hey, so I have a F32 435i xdrive and I was wondering if a K&N engine air filter would be better than an OEM engine air filter. Iíve read a lot of mixed reviews and from the reading I did on the E90 forum, itís just 50/50. I personally am looking to increase the performance of the car so I donít know which one would be better. Does anyone have any knowledge on this? Thanks in advance. (Iím most likely going to be getting a cold air intake, I would appreciate it a lot if you guys could recommend some good, reputable brands)
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      07-21-2019, 04:02 PM   #2
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I just bought a K&N air filter and I'm putting it in my car tomorrow. I'll let you know what it's like!
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      07-21-2019, 06:06 PM   #3
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Make sure you clean the MAF sensor regularly. The oils in these things are pretty bad.

In terms of performance gains you won't see any. Maybe some more intake noise...

I had it in my previous car because I found one cheaper than the OEM filter, but I went and replaced it soon. I feel better if I know there is no oil flying in my engine cramming my sensors
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      07-21-2019, 07:50 PM   #4
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Quote:
Originally Posted by F32_435xi View Post
Hey, so I have a F32 435i xdrive and I was wondering if a K&N engine air filter would be better than an OEM engine air filter. I’ve read a lot of mixed reviews and from the reading I did on the E90 forum, it’s just 50/50. I personally am looking to increase the performance of the car so I don’t know which one would be better. Does anyone have any knowledge on this? Thanks in advance. (I’m most likely going to be getting a cold air intake, I would appreciate it a lot if you guys could recommend some good, reputable brands)
A cold air intake is more for sound then anything else. I went with the AFE Power Pro Dry S air filter which doesn't use any oil. Ive read that the oiled ones can sometimes cause issues.
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      07-21-2019, 10:11 PM   #5
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Don't waste your money on a CAI. A quality drop in is going to give you the exact same benefits. That would be a louder air intake swoosh and maybe a couple ponies.

I personally run a KN filter with no issue. Just make sure to let it dry in the sun for a couple hours before re installing. If you think thats too much trouble, go with a dry type filter.

At the end of the day... an OEM paper filter isnt a bad idea either. Just depends if you want to keeo buying those or clean the aftermarket once a year. Comes down to preference mostly.
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      07-29-2019, 07:51 AM   #6
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i'd recommend a dry filter over the oily k&n.
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      07-30-2019, 05:13 AM   #7
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Quote:
Originally Posted by F32_435xi View Post
Hey, so I have a F32 435i xdrive and I was wondering if a K&N engine air filter would be better than an OEM engine air filter. I’ve read a lot of mixed reviews and from the reading I did on the E90 forum, it’s just 50/50. I personally am looking to increase the performance of the car so I don’t know which one would be better. Does anyone have any knowledge on this? Thanks in advance. (I’m most likely going to be getting a cold air intake, I would appreciate it a lot if you guys could recommend some good, reputable brands)
I have a CTS turbo intake setup for your car if your interested
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