For Sale: Karbonius CSL Carbon Airbox

[simplem3]

For sale is my lightly used Karbonius CSL carbon airbox. I purchased everything between 2023 and 2024, and the complete setup has less than 1,000 miles on it. As you can see in the photos, the carbon fiber is in excellent condition with no damage or issues.

This is a great opportunity for anyone interested in completing the CSL conversion while saving a significant amount compared to buying everything new. All components included in the sale are listed below and are fairly self-explanatory.

Serious inquiries only, please, and contact me through PM. I’m happy to answer reasonable questions about the condition or what’s included, but I won’t respond to messages that are primarily asking me to explain the products or the conversion. Please do your own research before reaching out.



I haven’t given much thought to parting anything out, since the real value here is someone getting everything needed for a plug-and-play installation.

That said, I’ll prioritize anyone interested in the complete package first, but I’m open to considering a part-out. If I parted-out, the items would be the csl airline and the ECU/DME.

Asking: $3800 for everything

[M3LSB.Gab]

How much ? V1 or V2 intake ? Carbon trumpets or plastic

[simplem3]

How much ? V1 or V2 intake ? Carbon trumpets or plastic

I’m going to release price with pics. I haven’t to check the market beforehand.

[hakuberry]

Interested depending on the price when updated.

[samthejam]

Soft Launching

[Tbonem3]

Garnering public interest

[Pklauser]

Is this an MSS54HP?

[simplem3]

Is this an MSS54HP?

No. non-HP

[Cubieman]

What is V1 vs V2 intake?

I know they have definitely made changes in their mold over time, just never heard off definitive versions with the Karbonius besides CSL/Race.

[simplem3]

What is V1 vs V2 intake?

I know they have definitely made changes in their mold over time, just never heard off definitive versions with the Karbonius besides CSL/Race.

beats me. I agree with you that I'm only familiar with CSL/Race.

[davidinnyc]

What is V1 vs V2 intake?

I know they have definitely made changes in their mold over time, just never heard off definitive versions with the Karbonius besides CSL/Race.

The older airboxes (2018/2019?) still utilized plastic trumpets as found in the stock intake box. The sound produced is slightly deeper in the lower RPM range, but they have since changed out the plastic trumpets for full carbon. I spoke with Karbonius about this and there is no power difference in either despite the larger, angled 6th trumpet in the rear.

[Cubieman]

The older airboxes (2018/2019?) still utilized plastic trumpets as found in the stock intake box. The sound produced is slightly deeper in the lower RPM range, but they have since changed out the plastic trumpets for full carbon. I spoke with Karbonius about this and there is no power difference in either despite the larger, angled 6th trumpet in the rear.

My Dec. of 2019 box was available with either carbon or plastic and I opted for C.F as I didn't know any better, must have been shortly after that.

Also, they changed the mold in 2020, the air filter on mine did not seal up quite right.

Info here:

https://nam3forum.com/forums/forum/main-forum/e46-2001-2006/250239-karbonius-airbox-issue-fix-myself-or-ship-back

They ended up sending me a piece of plastic and epoxy, ended up alight better but still not as good as the newer boxes.

[M3LSB.Gab]

Huge sound difference with plastic trumpets, you don't get the true CSL sound with CF trumpets.

[simplem3]

Uploaded a few pre-uninstall photos for reference. I never installed the BMW Power decal on the airbox, but I do have it, and it will be included.

[u2usual]

PMed you