Charcoal Filter Removal
Senior Members
Joined: Dec 2008
Posts: 455
Likes: 1
From: ///Moscow phucking city
Im so eager to do this mod! I run a 525i Sport built 05/2008 bought brand new in 12/2008. I got 12,000Km on the dial, I live in a dirty city Russia, Moscow Im afraid if I remove the Charcoal Filter my engine will start getting dirty, wont it?! 
So damn eager to do it! I've checked it out today under my hood all good just tell me that my engine's life wont be decreased from debris!!
So damn eager to do it! I've checked it out today under my hood all good just tell me that my engine's life wont be decreased from debris!!
Senior Members
Joined: Jan 2010
Posts: 1,521
Likes: 1
From: Houston, TX
Super Moderator
Joined: Jan 2008
Posts: 17,508
Likes: 3
From: So. Cal (SFV)
My Ride: 2011.5 Alpine White E90 M3 | Black Novillo Leather | Carbon Fiber Leather Trim | ZCP | ZP2 | M-DCT | Navigation | Moonroof | 6FL Mods: TMS 12.5mm spacers all around l Hawk HPS Brake Pads l OEM M3 Edition Grills l Paint Matched Side Gills l Key Hole D
https://5series.net/forums/topic/217...ost__p__722224
Senior Members
Joined: Jan 2010
Posts: 1,521
Likes: 1
From: Houston, TX
http://www.e90post.com/forums/showth...ne+filter+dyno
Senior Members
Joined: Jan 2009
Posts: 560
Likes: 2
I removed it and really I don't notice any performance gains. There is no way that little piece of paper is restricting air flow enough to retard engine performance, sorry guys. Think about it-- the rate limiting step to air flow is the air filter which is substantially thicker than the charcoal filter. Until I see a before and after dyno report I don't believe it makes one difference.
I tend to agree. I think it's more placebo effect until we get solid dyno numbers. But I guess it couldn't hurt.
Senior Members
Joined: Dec 2009
Posts: 531
Likes: 0
From: Los Angeles, CA
My Ride: 2000 540i/6: Silver
Model Year: 2000
did this last night before goin to buy cigarettes.
took me like 3 minutes.
you dont need to loosen the maf though.
I do have one question. I cant seem to get the 3rd latch (the one that is not attached) onto the airbox. the area is so small i really cant figure it out. anybody got any pics of this area or knows how to insert it back?
As far as the driving effect/sound.
1. There is an obvious increase in sound from the engine. Its a mild one but still there, and can be heard on idle and when pulling away in gear.
2. There is in fact a better response that you can feel. You can feel the increase in airflow in the pedal, and get a growl coming through to the exhaust. More noticeable if you're aftermarket i think.
3. Its not an abnormal thing to have this sort of airflow and throaty sound. The airbox is kinda big on top i think which is what gives the extra growl. In either case even with the stock filter, there is better throttle response. The sound and feel in the pedal is misleading, making you think it just got faster, which I dont think it did. But for a free mod, this is a must do and how the car should have came.
took me like 3 minutes.
you dont need to loosen the maf though.
I do have one question. I cant seem to get the 3rd latch (the one that is not attached) onto the airbox. the area is so small i really cant figure it out. anybody got any pics of this area or knows how to insert it back?
As far as the driving effect/sound.
1. There is an obvious increase in sound from the engine. Its a mild one but still there, and can be heard on idle and when pulling away in gear.
2. There is in fact a better response that you can feel. You can feel the increase in airflow in the pedal, and get a growl coming through to the exhaust. More noticeable if you're aftermarket i think.
3. Its not an abnormal thing to have this sort of airflow and throaty sound. The airbox is kinda big on top i think which is what gives the extra growl. In either case even with the stock filter, there is better throttle response. The sound and feel in the pedal is misleading, making you think it just got faster, which I dont think it did. But for a free mod, this is a must do and how the car should have came.
