Karbonius Carbon Fibre Stock S54 Plenum

[9kracing]

Looks good! Can't wait to see the final product.

[///MBan]

The prototype is now finished and Karbonius have provided new pictures. Fitment and sound to be tested next week.

[jet_dogg]

That is very nice, turned out well.

[tlow98]

So…

- increased sound
- no increase in power
- no low rpm stumbling
- no special tuning, vac lines, etc.
- decreased weight

seems like some nice trade offs. Hope it’s quite noisy!

[maupineda]

I think there maybe be some performance gain, the CSL box shape supposedly flows better as it skips muffling requirements the stock box maybe subject to.

you have MAF to compensate for flow variations and you can stick an EVENTURI for more sound and perhaps a bit more air and power?

i hope this makes it to the products shelf, ready to get one.

[Epoustouflant]

The prototype is now finished and Karbonius have provided new pictures. Fitment and sound to be tested next week.

They need to add an intake to this!

As always with Karbonius, beautiful craftsmanship.

[mtech9]

Not sure the CSL box add much though... Ive seen multiple CSLs dynode and pull less than stock M3s - so it clearly doesn't do much.
This box with an Venturi on the end would be interesting - but the price is too comparable to the 'real deal'. Guess it's appealing to smog places though.
Looks nice regardless.
Post 4 way sound test! (Eventuri, CSL, stock, this)

[Epoustouflant]

Not sure the CSL box add much though... Ive seen multiple CSLs dynode and pull less than stock M3s - so it clearly doesn't do much.
This box with an Venturi on the end would be interesting - but the price is too comparable to the 'real deal'. Guess it's appealing to smog places though.
Looks nice regardless.
Post 4 way sound test! (Eventuri, CSL, stock, this)

It’s also very appealing to MSS54 non HP guys. The cost for a CSL airbox approaches 4K USD without installation costs when you consider all that is needed.

[Casa de Mesa]

Wow, looks pretty stellar. Karb is always top notch. Can't wait to see this continue to unfold!

[heinzboehmer]

Not sure the CSL box add much though... Ive seen multiple CSLs dynode and pull less than stock M3s - so it clearly doesn't do much.
This box with an Venturi on the end would be interesting - but the price is too comparable to the 'real deal'. Guess it's appealing to smog places though.
Looks nice regardless.
Post 4 way sound test! (Eventuri, CSL, stock, this)

It definitely does make a difference.

My car dynoed 16 whp more with just the airbox and a stock CSL tune and 25 whp more with the airbox and an off the shelf PCS tune:

https://nam3forum.com/forums/forum/main-forum/e46-2001-2006/1925-s54-dyno-database?p=126356#post126356

[jet_dogg]

Let him think the airbox doesn't make power.

[Carbon.dre]

Why not just make a CSL MAF version? And use the race mold. It seems more simple since they already have those molds.

[maupineda]

Why not just make a CSL MAF version? And use the race mold. It seems more simple since they already have those molds.

No quite, MAF would not work on an aperture that big, and the box needs to be air tight between the MAF and the ITBs. That is why it has not been done already, and this is pretty much it!

[E46 M3]

Why not just make a CSL MAF version? And use the race mold. It seems more simple since they already have those molds.

There's a german one around, it's been sold for I guess 10 years now? It's pricey and most people seem to talk shit about it so never looked into it.

Most of the info was on m3forum and is now gone anyway.

[Carbon.dre]

There's a german one around, it's been sold for I guess 10 years now? It's pricey and most people seem to talk shit about it so never looked into it.

Most of the info was on m3forum and is now gone anyway.

Sucks because its a PITA to go MAP and the cost is basically a flex for 40hp. which makes me wonder why not use what they have and develop around a maf to see the results from testing