K&N Drop in Filter

wuufer001 · 02-11-2008, 02:29 PM

i just replaced my stock filter with the K&N drop in but didn't remove the charcoal filter. will just replacing the filter (kept charcoal inplace) give even the slightest difference that a person driving can notice? i read about removing the charcoal filter thread but don't know if its good for the engine or not cause i think they placed it there for a reason, but if removing the charcoal will make a even GREATER difference then maybe will think about it.

i know many of you will say Intake FTW but i think i will do the drop in first and see how it goes.

anyone that has either replaced the stock filter and/or removing the charcoal filter too please feed me with some input. thanks

(everything here is about stock intake)

323d · 02-11-2008, 03:50 PM

you will mentally think is louder and faster for the first week since you will be more focused on trying to hear for the change in sound of intake.. but infact it will do nothing.

sparkyg · 02-11-2008, 04:13 PM

Charcoal filter - air intake for passengers

K&N - air intake for engine

Edit: I did some reading. I found the filter on the airbox. BMW sure goes all

alex2112 · 02-12-2008, 04:32 PM

You most likely won't feel anything. The only way you might see a SLIGHT difference is maybe gas mileage?

xdrive · 02-12-2008, 06:40 PM

Shouldn't you be asking yourself that question as to whether you notice a perf. difference?

You changed the filter in your own car. So how does it feel? No difference?

d3l0n · 02-13-2008, 10:51 AM

slight, and only at higher speeds

scanboy · 02-13-2008, 11:56 AM

I removed the charcoal filter, but didn't replace the original air filter.
I can tell you I don't regret removing it as the difference is quite noticeable.
You will find that engine runs smoother than before at rpm < 2k.
I just did this last weekend, so I'll have to monitor the MPG for a bit, but I need to adjust my driving cause the engine reaches above 3k rpm faster, and I often forgot to up shift until it reaches 4k rpm (I'm not a high rpm driver).

wuufer001 · 02-14-2008, 12:23 AM

any one also remove the charcoal filter and have any problems? i'm kinda getting paranoid after removing the charcoal filter

kpxshorty · 02-14-2008, 12:55 AM

so if you remove charcoal filter, you will get better gas mileage?

sejoon85 · 02-14-2008, 09:59 AM

Sorry for the newbie question, but what is a charcoal filter?
Dont we just replace the oem drop filter with the stock filter?
The 2 mins procedure?

T i h o r · 02-14-2008, 10:19 AM

Quote:

Originally Posted by sejoon85

Sorry for the newbie question, but what is a charcoal filter?
Dont we just replace the oem drop filter with the stock filter?
The 2 mins procedure?

I'm just as lost as you bro.

What's all this talk about filters and what not?

bebecker · 02-14-2008, 10:35 AM

The confusion is because there are two charcoal filters. One charcoal filter for the cabin, this is replaceable, which is separte from the engine air filter. The second is behind the replaceable engine air filter in the factory intake box, this filter I believe was intended to be permanent. However, people have removed this charcoal engine air filter. Check DIY for details. This filter appears quite restrictive. I have removed it, but ended up going with a Simota in the end.

Phil325 · 02-14-2008, 03:26 PM

whats a simota

Phil325 · 02-14-2008, 03:26 PM

nm. its an intake.

uabimmer · 02-14-2008, 03:35 PM

I removed my charcoal filter and still have my stock air filter.
There is a noticable difference in the way the car breathes but I dont know if a can say its faster.
BTW I'm getting 21mpg-mostly city driving (and pretty spirited

)

Mattscott · 02-14-2008, 04:09 PM

Does the 335 have a charcoal filter? I just opened the air box, and only a drop in filter. I didnt see a charcoal sheet anywhere.

e90AW335i · 02-14-2008, 04:24 PM

Quote:

Originally Posted by Mattscott

Does the 335 have a charcoal filter? I just opened the air box, and only a drop in filter. I didnt see a charcoal sheet anywhere.

nope, I dont believe we do....

Mattscott · 02-14-2008, 04:30 PM

Quote:

Originally Posted by e90AW335i

nope, I dont believe we do....

I was all ready to DIM (do it myself) and remove it today. I guess now I'll paint the exhaust tips black

xdrive · 02-16-2008, 09:14 PM

Quote:

Originally Posted by uabimmer

I removed my charcoal filter and still have my stock air filter.
There is a noticable difference in the way the car breathes but I dont know if a can say its faster.
BTW I'm getting 21mpg-mostly city driving (and pretty spirited

)

Is the 21 mpg before the charcoal filter removal or after?

02-11-2008, 02:29 PM	#1
wuufer001 Colonel 375 Rep 2,348 Posts Drives: 2006 E90 M/T Join Date: Mar 2006 Location: DFW, TX//Taiwan//South Africa iTrader: (5) Garage List 2006 325i [9.34]	K&N Drop in Filter i just replaced my stock filter with the K&N drop in but didn't remove the charcoal filter. will just replacing the filter (kept charcoal inplace) give even the slightest difference that a person driving can notice? i read about removing the charcoal filter thread but don't know if its good for the engine or not cause i think they placed it there for a reason, but if removing the charcoal will make a even GREATER difference then maybe will think about it. i know many of you will say Intake FTW but i think i will do the drop in first and see how it goes. anyone that has either replaced the stock filter and/or removing the charcoal filter too please feed me with some input. thanks (everything here is about stock intake) __________________
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02-11-2008, 03:50 PM	#2
323d Major 52 Rep 1,436 Posts Drives: 335i E90 Join Date: Jan 2008 Location: YVR iTrader: (4)	you will mentally think is louder and faster for the first week since you will be more focused on trying to hear for the change in sound of intake.. but infact it will do nothing. __________________ ZSP susp//18's 550i reps//blacklines/aftermarket grill//
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02-11-2008, 04:13 PM	#3
sparkyg Brigadier General 142 Rep 3,523 Posts Drives: A6 Allroad Join Date: Sep 2007 Location: Oil Country iTrader: (5)	Charcoal filter - air intake for passengers K&N - air intake for engine Edit: I did some reading. I found the filter on the airbox. BMW sure goes all Last edited by sparkyg; 02-11-2008 at 08:56 PM..
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02-12-2008, 04:32 PM	#4
alex2112 Lieutenant 26 Rep 444 Posts Drives: 2016 X1 M-Sport Join Date: Sep 2007 Location: MA iTrader: (4)	You most likely won't feel anything. The only way you might see a SLIGHT difference is maybe gas mileage?
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02-12-2008, 06:40 PM	#5
xdrive Second Lieutenant 20 Rep 250 Posts Drives: 330xi Join Date: Nov 2005 Location: Chicago iTrader: (0)	Shouldn't you be asking yourself that question as to whether you notice a perf. difference? You changed the filter in your own car. So how does it feel? No difference?
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02-13-2008, 10:51 AM	#6
d3l0n I love the ///M3, but I want 550hp ///M5 141 Rep 3,276 Posts Drives: BMW330iE90 Join Date: May 2006 Location: NYC iTrader: (1) Garage List 2006 BMW 330i (E90) [9.00]	slight, and only at higher speeds __________________ .::d3l0n::. FS: OEM SG Side Skirts - Sparkling Graphite - PRE-LCI FS: OEM Carbon Fiber Rear Diffuser FS: (SG) E90 OEM Rear Bumper - Sparkling Graphite - Pre-LCI 328/330 i/xi
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02-13-2008, 11:56 AM	#7
scanboy Lieutenant 16 Rep 458 Posts Drives: E90 Montego Blue+Black Int. Join Date: Sep 2007 Location: Torrance iTrader: (0)	I removed the charcoal filter, but didn't replace the original air filter. I can tell you I don't regret removing it as the difference is quite noticeable. You will find that engine runs smoother than before at rpm < 2k. I just did this last weekend, so I'll have to monitor the MPG for a bit, but I need to adjust my driving cause the engine reaches above 3k rpm faster, and I often forgot to up shift until it reaches 4k rpm (I'm not a high rpm driver).
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02-14-2008, 12:23 AM	#8
wuufer001 Colonel 375 Rep 2,348 Posts Drives: 2006 E90 M/T Join Date: Mar 2006 Location: DFW, TX//Taiwan//South Africa iTrader: (5) Garage List 2006 325i [9.34]	any one also remove the charcoal filter and have any problems? i'm kinda getting paranoid after removing the charcoal filter __________________
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02-14-2008, 12:55 AM	#9
kpxshorty Captain 35 Rep 663 Posts Drives: 2008 E90 335i Join Date: May 2007 Location: Torrance iTrader: (7)	so if you remove charcoal filter, you will get better gas mileage?
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02-14-2008, 09:59 AM	#10
sejoon85 Captain 20 Rep 683 Posts Drives: AW e92 m3 Join Date: Sep 2007 Location: Vancouver iTrader: (1)	Sorry for the newbie question, but what is a charcoal filter? Dont we just replace the oem drop filter with the stock filter? The 2 mins procedure?
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02-14-2008, 10:35 AM	#12
bebecker Enlisted Member 1 Rep 42 Posts Drives: 2006 330i 2007 335i Join Date: Jan 2008 Location: South Dakota iTrader: (2)	The confusion is because there are two charcoal filters. One charcoal filter for the cabin, this is replaceable, which is separte from the engine air filter. The second is behind the replaceable engine air filter in the factory intake box, this filter I believe was intended to be permanent. However, people have removed this charcoal engine air filter. Check DIY for details. This filter appears quite restrictive. I have removed it, but ended up going with a Simota in the end.
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02-14-2008, 03:26 PM	#13
Phil325 Major 15 Rep 1,012 Posts Drives: 06 SGM E90 Join Date: Jul 2007 Location: West Melbourne, Fl/Jacksonville, FL iTrader: (0) Garage List 2006 325i [10.00]	whats a simota __________________ work in progress..
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02-14-2008, 03:26 PM	#14
Phil325 Major 15 Rep 1,012 Posts Drives: 06 SGM E90 Join Date: Jul 2007 Location: West Melbourne, Fl/Jacksonville, FL iTrader: (0) Garage List 2006 325i [10.00]	nm. its an intake. __________________ work in progress..
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02-14-2008, 03:35 PM	#15
uabimmer Україна 24 Rep 868 Posts Drives: JB e90 330i Join Date: Nov 2006 Location: Sac. California iTrader: (2) Garage List 2006 330i [0.00] 2003 330i [0.00]	I removed my charcoal filter and still have my stock air filter. There is a noticable difference in the way the car breathes but I dont know if a can say its faster. BTW I'm getting 21mpg-mostly city driving (and pretty spirited) __________________ IN THE PASSING LANE - e90 330 JetBlack / 6000k D1S / 40% all around / LED Lic.Plt. / LED reverse lights / 7500k Fogs
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02-14-2008, 04:09 PM	#16
Mattscott Major General 108 Rep 8,327 Posts Drives: 2007 335i E90 Join Date: Aug 2007 Location: Beaumont, CA iTrader: (2)	Does the 335 have a charcoal filter? I just opened the air box, and only a drop in filter. I didnt see a charcoal sheet anywhere. __________________ Legal Disclaimer: Anything I or anyone else says about my vehicle on this website(e90post.com or any affiliated or nonaffiliated sites), pertaining to modifications, is only to gain acceptance from my/our peers, and does not actually represent anything actually existing on my car, and thus, cannot be held against me in any issues, i.e. warranty claims, that may arise.
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