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      12-01-2012, 03:53 PM   #1
racerbruce
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The DO NOT REMOVE! paper filter in the top lid of the air box....

While installing my new BMC performance air filter, I noted there is paper filter integrated in the top lid of the air box....with a note on the side of the paper filter stating....DO NOT REMOVE!

It appears it is not removable. How is it replaced? Duration?


Thanks -
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      12-01-2012, 03:55 PM   #2
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Is a carbon filter.
No need to replace, as it's in the clean air stream after the paper filter below.

Its not available as a separate part.
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      12-01-2012, 03:56 PM   #3
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Thanks -
What is a canon filter? Never needs replacement?
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      12-01-2012, 03:58 PM   #4
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Typo... Fixed
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      12-01-2012, 04:00 PM   #5
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Well done and thanks -
A carbon filter w/a lifetime life cycle?
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      12-01-2012, 04:06 PM   #6
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IIRC, Its Emissions relate
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      12-01-2012, 04:21 PM   #7
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Quote:
Originally Posted by inTgr8r View Post
IIRC, Its Emissions relate
WHS ^^

Some have gone to dealer for warranty work and were denied by not having that filter there. There is a thread on it.

Also there is a tuner out in Vancouver who removed and dyno'd 1hp increase.

I've removed it and put it back. Can't feel any difference. Might as well keep it there.
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      12-01-2012, 05:35 PM   #8
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I think some earlier production models have a removable one, whereas others have the filter built-in to the lid of the OE airbox.
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      12-01-2012, 08:07 PM   #9
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Quote:
Originally Posted by Mirko View Post
WHS ^^

Some have gone to dealer for warranty work and were denied by not having that filter there. There is a thread on it.

Also there is a tuner out in Vancouver who removed and dyno'd 1hp increase.

I've removed it and put it back. Can't feel any difference. Might as well keep it there.
what is the name of the tuner shop in vancouver that did this?

thanks.
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      12-01-2012, 09:19 PM   #10
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Quote:
Originally Posted by 604skyline View Post
what is the name of the tuner shop in vancouver that did this?

thanks.
did a google search to find it

http://www.europeancarweb.com/projec...r/viewall.html

Quote:
With the car still on the dyno, I took the opportunity to perform a couple of quick and simple modifications to the stock intake system. The first was to remove the OEM charcoal filter residing in the top portion of the factory airbox. This brought about an average peak gain of 2.5 wheel-hp and 1 lb-ft of torque (this data has not been plotted).

Read more: http://www.europeancarweb.com/projec...#ixzz2DrRos4uT
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      12-02-2012, 09:04 AM   #11
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IIRC there was a TIS addressing removal of the charcoal filter and resulting rough idle problems. Some have reported idle problems and others have not after removal.
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      12-02-2012, 12:48 PM   #12
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Garage List
BMW NA issued an SIB:
http://www.bimmerfest.com/forums/sho...4&postcount=24


Quote:
Originally Posted by Incompatible View Post
IIRC there was a TIS addressing removal of the charcoal filter and resulting rough idle problems. Some have reported idle problems and others have not after removal.
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      12-02-2012, 01:33 PM   #13
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Quote:
Originally Posted by jmillet View Post
jmillet: thanks for the post and for correcting my terminology, one of these days I'll get it right.

Interesting that the SIB only addresses the M models. My 07 Si came with a charcoal filter, maybe removal of the filter in the N52 didn't create airflow problems. Also, my car did not have an air diffuser in the top lid (#2) as shown in the SIB for the M cars.
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Last edited by Incompatible; 12-02-2012 at 01:43 PM..
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      12-02-2012, 11:13 PM   #14
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Not sure if my 2004 had one or not, at least I don't think it did by the time I got the car. I have the AFE intake now though.
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