Originally Posted by GsQ

let me ask maybe a possibly dumb question. where is this throttle response coming from by removing the charbroiler is it just more air whats the logistics here.

Originally Posted by dezenuts

To put this into scientific terms, the filter is like the cars boogers that needs to be taken out to help the car breath better

Originally Posted by GsQ

Ok so after reading this last night what did i do this morning you may wonder????? I pulled the charcoal filter out (DUH!) which took about 1 minute. Upon starting the car you can hear the difference way more so than i thought. I simply expected it to be a touch louder but it is much more throaty especially at low rev 1 to 4k rpms. You cannot hear the difference really past that. As far as throttle response i dunno because i have rpi scoup with BMC filter and a SB v2 i might not be noticing it that much but maybe if i had neither i would notice it.

My only concern is that although more throaty it sounds like a quasi diesel engine now which i might not like. On top of that therussian is making me feel guilty about polluting the environment!!! So i dunno what im going to do it may grow on me im goning to continue to drive without it for now. DEFINITELY NOT THE PLACEBO EFFECT THOUGH try and see for yourself you can always put it right back in.

Originally Posted by jrsamps

I can remember similiar threads dating back as far as 2006. I removed the additional filter a number of years ago. I heard no difference, saw no difference, I guess that means no difference although I might of had a slight uptick in MPG but even that is not concrete. Someone said it best, the placebo effect. If it did change the air mixture, I'm quite sure on board computer would compensate

Originally Posted by turboawd

try breathing through a towel. then fold the towel and try breathing through it. same principle with the engine. the intake air has to go through 2 filters with that charcoal filter. since bmw doesnt install this on the euro cars, i'm going to try it.

Originally Posted by Krozi

Dude non of you know what you're talking about...wanna know what happens when you take out the charcoal filter?

This:

Originally Posted by Krozi

Dude non of you know what you're talking about...wanna know what happens when you take out the charcoal filter?

This:

Originally Posted by v_therussian

Good one!


Sorry dude Don't feel bad. This is minute, compared to what mishandling of the Fukushima crisis will do to the planet...


LOL Yep, I've seen plenty of them over my years here too. I still haven't pulled the filter. I can offer this: if anyone in NYC has same-spec 530Xi - stick, stock ECU and stock exhaust, RPI scoop and BMC filter - and wants to remove the charcoal filter, let's meet up, flip a coin for who's filter we remove, take it out and drive cars back to back. If there's a noticeable difference, this should solve this issue once and for all.

BTW on V8 engines, I'd imagine, the difference is probably more noticeable, so staging an experiment like this on a pair of 545's or 550's might provide better information.

Originally Posted by v_therussian

Is that what came up on your iDrive after installing the exhaust?

Originally Posted by dezenuts

i have a 525i (so weak) and whenever i hit the gas there is such a huge lag, but not anymore with the filter removal. what I'm thinking is people with more powerful engines don't feel it because their cars are already fast anyone agree?