CSL Airbox Question - 2005 M3 SMG

[M3logik]

Prepping for my Karbonius airbox install.

My M3 has the following ventilation hose with a sensor attached to it. I've performed two other airbox installs but both of them didn't have #2 pictured below.

Is this sensor rerouted or deleted when I do the airbox install?

2005 M3 Diagram



2002 M3 CSL Diagram



Thanks for the assistance!

[180SXTCY]

weird, mine is a 2005 and its hose is as per the "2002 csl diagram" you've posted above.

[Cubieman]

The CSL tune won't recognize that sensor and the default position of that valve is open, or at least I believe it is.
My 2004 had that setup and I removed it and installed a vacuum cap over the place on the air rail that the smaller tube/valve was once attached to. I later bought an air rail that didn't have the extra port/clip for that valve purely for looks.

I have seen numerous photos of CSL airboxes and people kept that valve in place so I honestly don't know if it matters or not.

Edit: I asked a similar question when I did my airbox install.

https://nam3forum.com/forums/forum/main-forum/e46-2001-2006/17405-csl-breather-tube

[M3logik]

The CSL tune won't recognize that sensor and the default position of that valve is open, or at least I believe it is.
My 2004 had that setup and I removed it and installed a vacuum cap over the place on the air rail that the smaller tube/valve was once attached to. I later bought an air rail that didn't have the extra port/clip for that valve purely for looks.

I have seen numerous photos of CSL airboxes and people kept that valve in place so I honestly don't know if it matters or not.

Edit: I asked a similar question when I did my airbox install.

https://nam3forum.com/forums/forum/m...-breather-tube

Thanks for the reply. Great info you've got in your thread!

I'll probably just pick up a new air rail and be done with it. Do you happen to have the part number handy? Is it a 1 for 1 swap with the rail?

[Cubieman]

Thanks for the reply. Great info you've got in your thread!

I'll probably just pick up a new air rail and be done with it. Do you happen to have the part number handy? Is it a 1 for 1 swap with the rail?

Part no. 13547831481

Yes, it's just a simple swap one for the other.

[Nick_P]

If running AlphaN on a later model car, I guess that valve will still be operational? Best option would then be to modify a CSL tube to work with that sensor still in place?

[M3logik]

In the other thread, they were saying that the valve is open as a default. IMO, the best option is to get a new rail and just delete the valve.

I don't have first hand information to say whether or not the Alpha-N tune will still recognize the valve. Cubieman's thread mentioned that the valve would not be recognized.

Check Cubieman's thread, lots of great info in there.