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X3 E83 (2004 - 2010)
Talk about the E83 BMW X3 in this forum!

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  #1  
Old 05-04-2011, 07:43 PM
07X3Clardini 07X3Clardini is offline
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Location: Greenville,SC
 
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Mein Auto: 2007 BMW X3
Noticed Something odd..

Well i put a K&N filter in my X3 and took the Lid off (top piece with the Maf connected) . Well I noticed that there is another filter above the air filter. I was wondering if anyone knew what it was there for?

Thanks

Nick
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  #2  
Old 05-06-2011, 01:30 PM
UncleJ UncleJ is offline
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Mein Auto: '06 X3
No one knows? Must be someone out there who can shed some light on this.
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  #3  
Old 05-06-2011, 02:50 PM
Supercourse Supercourse is online now
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Location: British Columbia, Canada
 
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Mein Auto: 2004 X3 2.5i
In the big lid of the air box?

Item 1 in this diagram:

http://www.realoem.com/bmw/showparts...88&hg=13&fg=20

Seems that it should be referred to as a baffle rather than a filter.

Good thing it's not a routine maintenance replacement at $350!

Either to reduce intake air noise or to channel the airflow in a particular way to the MAF,
according to discussion in this M5 forum:

http://www.m5board.com/vbulletin/e39...ck-airbox.html

(Don't forget to be very careful with K&N's come re-oiling time. MAFs are expensive.)
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Old 05-07-2011, 07:47 AM
UncleJ UncleJ is offline
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+1 on the reoiling of the K&N! Have stopped using them myself because I have not seen any benefit, other than saving the cost of a new OEM filter insert.
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  #5  
Old 05-07-2011, 03:04 PM
UberXY UberXY is offline
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Quote:
Originally Posted by UncleJ View Post
+1 on the reoiling of the K&N! Have stopped using them myself because I have not seen any benefit, other than saving the cost of a new OEM filter insert.
+1

K&Ns are a good choice for cars with carbs, but I would be reluctant to use them around EFI MAFs.


Ub
00 M5, 05 X3, 08 X3, 64 Corvette, 88 Landcruiser, 84 911
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