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      01-13-2020, 08:45 PM   #1
sinbad4
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K&N Performance Air Filter for M40i !!

I had previously noted that the K&N Air Filter for the MY2020 X3M40i was different than the 2018/19 model years. Not much.. but enough so it won't work. I've been impatiently waiting. My BMW SA tells me the part# is 13-71-8-581-691. I was hoping to match with Z4 or other model, but didn't have much luck.

Last week I wrote to K&N Support. They said they have no official part; but it said: BMW part number 13-71-8-581-691 cross references to K&N air filter 33-3134 linked: https://www.knfilters.com/33-3134-re...ent-air-filter

I was pleased to hear. Ordered directly. ($70) Just delivered. Just installed.

w00t!! It works! Perfect fit!

Selling my old one cheap, if interested (local pickup only). https://x3.xbimmers.com/forums/showt...4#post25679494

I am big believer in K&N filters and have used for years. I always heard 5-10hp.. that was on lesser cars. Performance Engineering did some tests.. they saw 3.6% increase in performance. That would be about 14HP on the 2020 M40i.

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Last edited by sinbad4; 01-13-2020 at 08:51 PM..
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      01-13-2020, 11:01 PM   #2
John26830
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Oil treated..? Any issues with sensors possibly?
I have used K&N in my other cars & they do make a superior filter
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      01-14-2020, 02:28 AM   #3
mariopl
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How about 30i? Do they produce a filter for 30i and does it provide any performance boost?
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      01-15-2020, 04:25 PM   #4
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Quote:
Originally Posted by mariopl View Post
How about 30i? Do they produce a filter for 30i and does it provide any performance boost?

33-3079 = K&N air filter model number on the USA website for a 2019 X3 30i. Probably a minimal boost, but I've always liked these filters for providing a bit better throttle response.

FB929/20 = BMC also makes an air filter for the 30i.
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      01-15-2020, 10:51 PM   #5
suby01
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Great work. Great find. Thank you X's a 1000 for sharing this with us.
Now were still searching to cross reference an intake part #.
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      01-15-2020, 11:13 PM   #6
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Installed too like a month ago. And I feel a big difference.
Did you saw our original filter??!?! I guess its made for off road !?!
Maybe on other cars you don't feel difference because stock filter its kind of the same....but in our case our stock is 1.3 times fatter.
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      01-16-2020, 01:14 AM   #7
suby01
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Quote:
Originally Posted by AvetNY View Post
Installed too like a month ago. And I feel a big difference.
Did you saw our original filter??!?! I guess its made for off road !?!
Maybe on other cars you don't feel difference because stock filter its kind of the same....but in our case our stock is 1.3 times fatter.
You mean you also installed the KN?
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      01-16-2020, 02:48 PM   #8
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Quote:
Originally Posted by suby01 View Post
You mean you also installed the KN?
Yes correct
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