BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > Regional Forums > UK > UK Technical Forum > 335i Drop in air filter help

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      02-12-2010, 06:25 AM   #45
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Originally Posted by Ant Man View Post
What about E92 M3 Imran. Is the gruppeM any good for power / torque or just make a wonderful noise?
Haven't dyno'd a Gruppe M but we have dyno'd an intake we had developed.

You can see more details (dyno graphs/videos) here
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      02-12-2010, 07:00 AM   #46
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Alpina_B3_Lux - Very imformative post, thank you kindly.

I was not after more power from the filter, just improved throttle response / air flow

- Apologies, should have been clear in my original post.

From your response and others its confirmed my thoughts

Last edited by DrunkenMonkey; 02-12-2010 at 07:37 AM.
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      02-12-2010, 05:32 PM   #47
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Originally Posted by RagingKileak View Post
Do it mate.

I'm sure between me and friends I'd give it a go.

OK for my intake I purchased the following from http://www.auto-performance.co.uk:

1 x 2 45 degree silicone elbow
2 x 2 90 degree silicone elbow
1 x 3 to 2 silicone straight reducer
5 x 100mm 2 aluminium hose joiner
1 x 100mm 3 aluminium hose joiner
7 x Jubilee Hose Clips - 55mm to 70mm
2 x Jubilee Hose Clips - 70mm to 90mm

I cut and modified one of the 2 aluminium hose joiners so that it has a 90 lip on the end. You can see this in the photo where the lip is inside the air box, with a rubber o-ring behind it to create a seal. This is then secured on the outside using a jubilee clip.

The air filter is a K&N Round Tapered (Cone) Universal Air Filter (option RR-3003). I bought this from http://www.demon-tweeks.co.uk/

All of the silicone hose needs cutting, use my photos to judge where I made my cuts.

These items were configured from the air box down as below:

1 Modified hose joiner, with rubber o-ring
2 45 degree elbow
3 90 degree elbow
4 60mm (aprox) straight off cut from 45 degree elbow (this is placed over a 100mm hose joiner and attached to the 90 degree elbows at either end)
5 90 degree elbow
6 3 to 2 reducer
7 Air filter

You will notice on the last photo that I have also cut the n/s brake air duct to provide air flow to the air filter. I have also secured the filter using cable ties to a conveniently placed tab beneath the headlight unit.

You can see in the second photo that the hose, after the first 90 degree elbow, runs left towards the engine bay. This is important to prevent the hose from being squashed by the inner wheel liner.

I hope this helps.

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      02-18-2010, 10:36 AM   #48
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Just dropped in the BMC filter over lunch......

I'm sure it won't to anything, but we'll see on the way home
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      02-18-2010, 11:28 AM   #49
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Originally Posted by Ant Man View Post
if you thought of that yourself, then I salute you

I pioneered the cold air feed from M3 to my 330
plus one!!!....

this is some creative genius at work!!!...and good DIY skills aswell!!!

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      02-21-2010, 06:54 AM   #50
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well thought I'd just update

fitted the filter last week, and have to say the engine does feel a little free'er flowing if that makes sense, & although yes it could just be placebo.. Im willing to bet its not.

However, it may not be the branded filter - as you can see the old filter was pretty dirty...

so if anything the best advise is :

Originally Posted by willhollin View Post

Just replace it more often than the manufacturer recommends.
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      11-08-2012, 04:15 PM   #51
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This is good data. Installed the Cobb ECU (stage 1 sport). I've been reading that I really need to get better airflow before moving to stage 2, and was considering a drop in as a cheap remedy. Not sure I'll even move to stage 2, but would appreciate the extra air flow. Also, agree with the previous posts recommending the oil catch can. Every car should have one of these, an N54 for sure though. Thanks for all the great data.
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