[TallGibbs]

Here are a few pictures and a quick DIY for those looking to drop in air filter replacement and also the charcoal filter delete.

Time Required = 10-15 minutes (especially if you have the correct torx tool with proper length handle).
Skill Required = 1 out of 5 (as basic as it gets)
Tools required = T25 (Torx 25). Ideally adjustable length extension handle. I used my computer repair tool kit which has a telescoping handle for various lengths. You do not want to use a "normal" torx key tool (the one with like 7 different sizes that flip out). You will not have room to get down to 2 bolts.

Instructions:

1. Loosen the T25 screws around the air filter housing (no need to remove strut tower bar). No need to remove the band clamp either (which connects the intake hose to the intake filter housing). You do NOT need to fully remove these screws, just loosen them until the threads are out of the "bottom" half of the airbox housing (the threads will keep them nicely attached to the top half when you pry the airbox open).

2. Pry open the filter housing

3. Remove the yellow OEM air filter

4. Remove the 2 charcoal filters (2 per side, 4 total on the car). Do this by pulling them straight through the plastic "grating." You should NOT have to break anything, they are not in there that tightly. There are 2 different size charcoal filters. One pulls out easily from the end and the other pulls out more easily from the middle of the filter.

5. Drop in the new filter, and be sure it sits nicely (tight) on the housing lip or else you won't be able to close the air box securely. The moulded plastic gasket around the outside of the filter should be obvious how it drops in (at least it was on my BMC filters).

6. Close the airbox back up and tighten all the T25 again.

7. Go drive with more power and test your butt dyno

[BIGW0RM]

I just got a 25 6MT and when I checked mine, it didnt have them. It doesnt even have the diamond housing the charcoal filters fit into. I thought was odd. All my other G series M cars had them.

[RobM2]

Curious if the airbox (or at least the lid where the charcoal filter sits) is a different part number 2024 vs 2025 then.

[TallGibbs]

Originally Posted by BIGW0RM

I just got a 25 6MT and when I checked mine, it didnt have them. It doesnt even have the diamond housing the charcoal filters fit into. I thought was odd. All my other G series M cars had them.

Are you in the USA? I think these are only required in the US due to California regulations.

[TallGibbs]

Originally Posted by RobM2

Curious if the airbox (or at least the lid where the charcoal filter sits) is a different part number 2024 vs 2025 then.

I think my 1st picture shows a QR code, maybe a part number to compare against for anyone with a 2025.

[BIGW0RM]

Originally Posted by TallGibbs

Are you in the USA? I think these are only required in the US due to California regulations.

I am. And Im in California. As I said, its the first time I did not see them installed in the many M cars Ive owned. Strange.

[BroDoze]

Hey those are my filters! lol

Nice DIY guide!

[mike@x-ph.com]

[tsn]

Any difference in sound?

[carlos916]

ahh i remember doing this on my e92 and here i am on a G87
super easy mod! thanks for the DIY!

[Resoelg]

Did it last weekend. Thanks for the heads up! Didn't even realize this was a "thing"when installing the BMC filters. Improved butt dyno? Possibly? Easy DIY.

[TallGibbs]

Originally Posted by tsn

Any difference in sound?

I’m not totally sure because I’m still in the 1,200 mile break in period so not taking the engine above 5,000 RPM (only at 357 miles on the car still).

I doubt the sound will be much different because the filters are still inside the airbox. However, I’m certainly not the best person to answer that question (nor do I have any decibel meter data &#128512.

[mike@x-ph.com]

Originally Posted by tsn

Any difference in sound?

Some say they notice an increase in sound on high RPM, i dont find it noticeable.

if you want more sound, get an intake not just filters.

[fastgoat]

Originally Posted by BIGW0RM

I just got a 25 6MT and when I checked mine, it didnt have them. It doesnt even have the diamond housing the charcoal filters fit into. I thought was odd. All my other G series M cars had them.

My 2025 also does not have the charcoal filters. Purchased brand new and just did Dinan drop in filters.

[TallGibbs]

Originally Posted by fastgoat

My 2025 also does not have the charcoal filters. Purchased brand new and just did Dinan drop in filters.

Interesting. I wonder if CA dropped the requirement or what else changed? Maybe that’s how the ‘25 gained all the extra Hp 😀

[BIGW0RM]

I just traded in my 25 6MT M2 for an auto M2 and it also does not have the charcoal filters. They must have removed them for good.

[Dave07997S]

Originally Posted by BIGW0RM

I just traded in my 25 6MT M2 for an auto M2 and it also does not have the charcoal filters. They must have removed them for good.

My 24 had them and it was a late 24 build.