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E90/E91/E92/E93 (2006 - 2013)
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  #1  
Old 03-20-2013, 11:57 AM
ptrcd003 ptrcd003 is offline
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Removing permanent charcoal air filter

Has anyone done this? I found a discussion on the 5 series forums, but theirs seems to be glued in. Is the 3 series also glued, or is it part of the assembly?
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  #2  
Old 03-20-2013, 01:40 PM
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Zooks527 Zooks527 is offline
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Quote:
Originally Posted by ptrcd003 View Post
Has anyone done this? I found a discussion on the 5 series forums, but theirs seems to be glued in. Is the 3 series also glued, or is it part of the assembly?
Assuming you're talking about the cabin air filter, it's a simple 10 minute task.

6 screws hold the cover and filter to the base. Remove the screws, pop the cover off, pop the microfilter out, put a new one in, screw it back down.

Pay attention to the orientation of the filter as it comes out. It only goes back in 1 way, but there's 4 ways you can position it (1 correct, 3 wrong) if you're not paying attention.
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  #3  
Old 03-20-2013, 01:44 PM
ptrcd003 ptrcd003 is offline
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Quote:
Originally Posted by Zooks527 View Post
Assuming you're talking about the cabin air filter, it's a simple 10 minute task.

6 screws hold the cover and filter to the base. Remove the screws, pop the cover off, pop the microfilter out, put a new one in, screw it back down.

Pay attention to the orientation of the filter as it comes out. It only goes back in 1 way, but there's 4 ways you can position it (1 correct, 3 wrong) if you're not paying attention.
No, I'm talking about the permanent filter built into the intake. It sits adjacent to the replaceable engine intake filter.

This one on the left:

Last edited by ptrcd003; 03-20-2013 at 01:49 PM.
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Old 03-20-2013, 01:51 PM
Leekay07 Leekay07 is offline
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no we don't have one.
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  #5  
Old 03-20-2013, 01:52 PM
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boramkiv boramkiv is offline
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Quote:
Originally Posted by ptrcd003 View Post
No, I'm talking about the permanent filter built into the intake. It sits adjacent to the replaceable engine intake filter.
It's not glued in on the E60, but secured by clips albeit extremely tough clips. They're removable, and a few people did even though it says do not remove on it. There's a bit of a deeper sound on WOT and a 1-2 MPG increase at best.
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Old 03-20-2013, 01:57 PM
ptrcd003 ptrcd003 is offline
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Originally Posted by Leekay07 View Post
no we don't have one.
I'm looking at it as we speak.
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  #7  
Old 03-20-2013, 02:02 PM
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boramkiv boramkiv is offline
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Originally Posted by ptrcd003 View Post
I'm looking at it as we speak.
If you indeed have one you can choose to remove it by prying a flat tip screwdriver between it and the side of the air box itself. Pry the corners and work around, it should pop out.
Absolutely nothing wrong running without it. I've had mine removed over a year now, and coupled with an RPI scoop and K&N filter. The sound is noticeably different under load.

EDIT: The increase in MPG was due to the fact that I did a bunch of maintenance on my car at the same time, (coils, plugs, belts, hoses, coolant, oil...) so the MPG may or may not change

Last edited by boramkiv; 03-20-2013 at 03:42 PM.
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  #8  
Old 03-20-2013, 03:17 PM
ptrcd003 ptrcd003 is offline
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Just tried, and it seems like the filter is built into the air box? I do not see a seam, and the plastic around it actually cracked when I tried to try it apart with a screwdriver.


Last edited by ptrcd003; 03-20-2013 at 03:20 PM.
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  #9  
Old 03-20-2013, 03:23 PM
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boramkiv boramkiv is offline
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It's not built into the airbox on the E60, and im sure it is not on the E90.
Here's mines removed:
http://www.bimmerfest.com/forums/alb...ictureid=26627

Last edited by boramkiv; 03-20-2013 at 03:31 PM.
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  #10  
Old 03-20-2013, 03:26 PM
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tturedraider tturedraider is offline
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My best recollection of how most people remove it is by cutting it out.
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  #11  
Old 03-20-2013, 03:27 PM
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boramkiv boramkiv is offline
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The issue is the part number could not be found on that filter at all so it could be replaced. If you needed to order it, you would have to order the whole intake silencer which is ridiculous.
It's held together by clips on the E60. I can't imagine it being part of the box on the e90.
It's not listed here:
http://www.realoem.com/bmw/showparts...48&hg=13&fg=20
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  #12  
Old 03-20-2013, 03:36 PM
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boramkiv boramkiv is offline
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Originally Posted by tturedraider View Post
My best recollection of how most people remove it is by cutting it out.
Seems to be the case with the E90 as crazy as that is.

http://www.e90post.com/forums/showthread.php?t=21590

Last edited by boramkiv; 03-20-2013 at 03:47 PM. Reason: Guess I need to stick to the E60 forums...facepalm!!
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  #13  
Old 03-20-2013, 05:09 PM
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Pilgrim Pilgrim is offline
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Just make sure that when removing something like that, you can put it back together if needed. Cutting it out might result in a lot of work if you have to return it to stock. Neatness counts.
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  #14  
Old 03-20-2013, 05:26 PM
ptrcd003 ptrcd003 is offline
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Finally got it out. Cut the filter, then used a dremel with a sanding bit to clean up the edges. If, for whatever reason, I need to replace it, I can pick up an entire silencer box from a junkyard for around $50. If anyone plans to do this, make sure you soak the filter first to avoid dust.
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  #15  
Old 03-20-2013, 07:22 PM
Cultr Cultr is offline
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Really doesn't seem to make sense to cut it out in a 328, the only difference that can be felt is if you use a less restrictive (and less filtering) K&N filter instead of the OEM, even then effects have been minimal. But if you already did it, make sure there are no lose particles anywhere that could get sucked into the engine
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  #16  
Old 03-21-2013, 12:08 PM
racermp racermp is offline
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i removed mine, it was glued on, just cut it out with a blade. heard it was a emmissions thing when you turn off the car, it doesn't spit carbon out into the air backwars or soemthing. i donno

i also added a k&n filter. on my 330i, it was more free revving, especially at higher rpms when the final stage of the intake opens up. so far, over 10k and no issues. all running perfectly well.
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  #17  
Old 03-21-2013, 12:49 PM
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Verts4Ever Verts4Ever is offline
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Originally Posted by Cultr View Post
Really doesn't seem to make sense to cut it out in a 328
It also doesn't make any sense to do it on a 335i. Any benefits perceived from doing so are entirely placebo.

From a weightlifting perspective, removing the carbon filter is the equivalent of taking tribulus.
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  #18  
Old 03-21-2013, 01:20 PM
E90raw E90raw is offline
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While we are on the subject of K/N filters, is it really worth adding this over the OEM filter? I read somewhere you should not attempt to clean it, but instead just replace the entire filter with a new one.
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  #19  
Old 03-22-2013, 08:10 AM
racermp racermp is offline
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Originally Posted by E90raw View Post
While we are on the subject of K/N filters, is it really worth adding this over the OEM filter? I read somewhere you should not attempt to clean it, but instead just replace the entire filter with a new one.
for me, it made a big difference while shifting gears, just in town drive-ability got alot better. i do think the power band is more even all the way to redline. i still had a bit of an uneven weird lag between 1k-1.8k rpm even after the k&n and charcoal removal. (off topic), i did the golf tee unplug thing a few days ago and now it feels good in traffic. i'll do plugs next maybe it will help.

i don't think k&n adds any power, just cleans up the power band and throttle response.

Last edited by racermp; 03-22-2013 at 08:14 AM.
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  #20  
Old 03-22-2013, 08:29 AM
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boramkiv boramkiv is offline
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Originally Posted by E90raw View Post
While we are on the subject of K/N filters, is it really worth adding this over the OEM filter? I read somewhere you should not attempt to clean it, but instead just replace the entire filter with a new one.
The issue with cleaning is usually overlubrication. One or two nice mists on the dirty side is usually enough.
They are good filters. The fact that you reuse it makes it cost effective overtime. The sound is nice too.
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Old 03-22-2013, 08:49 AM
ptrcd003 ptrcd003 is offline
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Originally Posted by boramkiv View Post
The issue with cleaning is usually overlubrication. One or two nice mists on the dirty side is usually enough.
They are good filters. The fact that you reuse it makes it cost effective overtime. The sound is nice too.
They're only cost effective over a very long period of time though. The filter costs two times more than stock + the cleaning kit. Dealers change the filter every other oil change, so it would take ~4 years to break even just on the filter cost. Also a risk that you could over-oil and destroy your MAF.
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Old 05-29-2015, 09:43 AM
henryting henryting is offline
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Don't do it .....and here is why !

Quote:
Originally Posted by ptrcd003 View Post
Has anyone done this? I found a discussion on the 5 series forums, but theirs seems to be glued in. Is the 3 series also glued, or is it part of the assembly?

DON'T ever remove the secondary filter. There is a reason BMW put an additional filter for all its models. Once you removed the secondary filter, there is only a thin paper element of the changeable filter between the outside element and your car's engine. The secondary filter is there to safeguard if the primary filter fails and it will for a number of reasons.

Firstly, the primary filter have no reinforcement. It is just held together by the gasket and sandwiched in the air box. It does not have a wire mesh acting as a re-bar.

Secondly, if you are driving through different elements such as in the height of the mountains where the temperature is very low and than descending to sea-level, sometimes condensation happens and the filter being a paper element gets soggy and if there is a chance that it collapses, all the debris will ended up sucked into your engine and you just signed a death warrant to your engine.

Thirdly, regardless of how well made paper filters are, they are still paper and for any number of reasons, such as manufacture defects, faulty gasket, or crack in your air box, .....etc...etc..., you risk ruining your engine if the filter fails and there is no secondary filter to protect the engine.

If you could ever find a filter other than the oil-treated filters (such as K&N that has a metal mesh to reinforce the flimsy paper element), than by all means remove the permanent filter because chances of the primary filter collapsing is almost impossible. However, I personally just do not like oil-treated filters. I prefer plain paper filters, but they all come with no metal reinforcement.

Think about this. Once you remove the secondary filter, you only have a single paper element protecting the intake from debris. And if it ever collapses, don't blame BMW for it.
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Old 05-29-2015, 10:12 AM
fdriller9 fdriller9 is offline
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Originally Posted by henryting View Post
DON'T ever remove the secondary filter. There is a reason BMW put an additional filter for all its models. Once you removed the secondary filter, there is only a thin paper element of the changeable filter between the outside element and your car's engine. The secondary filter is there to safeguard if the primary filter fails and it will for a number of reasons.

Firstly, the primary filter have no reinforcement. It is just held together by the gasket and sandwiched in the air box. It does not have a wire mesh acting as a re-bar.

Secondly, if you are driving through different elements such as in the height of the mountains where the temperature is very low and than descending to sea-level, sometimes condensation happens and the filter being a paper element gets soggy and if there is a chance that it collapses, all the debris will ended up sucked into your engine and you just signed a death warrant to your engine.

Thirdly, regardless of how well made paper filters are, they are still paper and for any number of reasons, such as manufacture defects, faulty gasket, or crack in your air box, .....etc...etc..., you risk ruining your engine if the filter fails and there is no secondary filter to protect the engine.

If you could ever find a filter other than the oil-treated filters (such as K&N that has a metal mesh to reinforce the flimsy paper element), than by all means remove the permanent filter because chances of the primary filter collapsing is almost impossible. However, I personally just do not like oil-treated filters. I prefer plain paper filters, but they all come with no metal reinforcement.

Think about this. Once you remove the secondary filter, you only have a single paper element protecting the intake from debris. And if it ever collapses, don't blame BMW for it.
This is absolutely false.

The purpose of the charcoal filter is scrub fuel vapors trapped in the intake system after the motor is shut off on port injected motors.

The charcoal filter is BEHIND the paper filter. By your logic, if the paper filter fails, it will collapse INTO the charcoal filter.
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Last edited by fdriller9; 05-29-2015 at 10:19 AM.
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  #24  
Old 05-29-2015, 10:16 AM
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Zooks527 Zooks527 is offline
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.... SNIP ....

At this point in time, you have 3 posts total, and all of them are resurrecting years old zombies. Dude, check the dates.
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Last edited by Zooks527; 05-29-2015 at 10:19 AM.
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  #25  
Old 05-29-2015, 10:38 AM
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I'd say you should just replace the air box with a new one... but that won't be necessary for a long, long time. I'm guessing it's good to do at, say, 200,000 miles.
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