Karbonius Carbon Fibre Stock S54 Plenum

[///MBan]

We now have 19 EOI and just need one more for the 20 minimum set by Karbonius. If you’re keen, please put your hand up!

[///MBan]

There have been lots of good comments in threads about how well, if at all, this will work. Karbonius isn’t sure either (see quote below) but is willing to try if they can see there is enough customers to make it worthwhile if it does work.

I can this will be less attractive to M3 owners due to being able to run a factory setup based on a MAP sensor. If I had of bought an M3 (which had actually happened before the seller reneged on our agreement and sold the car to someone else) I would probably have gone with a full CSL setup and never given a thought to an option like this.

But, there are a number of reasons even M3 owners might be interested in this and hopefully we can get gather enough interest to see if it will work.

Karbonius:
”until we made the first unit we didn´t know what will be the sound, if louder or lower sound comparing with CSL, at first I would say lower than CSL, and this could be a problem, expend a lot of money on the mold and finally didn´t get the expected sound !!!”

[///MBan]

Count me in. Been on the fence for the past 2 years. Straight plug and play would be a win win for me.

Thanks - I’ve added you to the list on zpost. We’re up to 17 EOI now, so not far away from the 20 for Karbonius to make a test.

[Obioban]

I feel like this is a better notion for the Z4M people, because they can't run the MAP sensor/tune -- they're stuck with straight Alpha N. For us, there's no issue in getting it to run correctly using the MAP setup.

[Nate047]

This won't be CARB legal either so what's the point

[zzyzx85]

fyi: this was posted in the Group Buy section a little while ago: https://nam3forum.com/forums/forum/m...s54-plenum-eoi

I think it's a great idea

[Epoustouflant]

Indeed. The most ideal result from this would be the sound gain you get from S65 carbon plenum vs. stock plenum. There is a significant volume & tone change with the carbon plenum. And I believe the carbon plenum for S65 do maintain stock-ish internals.

This is true!

Eventuri & CarboProject both retain the OEM trumpets design. The carbon allows for more resonance to pass through, and it is also thinner than the ABS used to make these plenums.

Karbonius & Haimus Racing both offer plenums with revised trumpet designs.

There would definitely be noticeable sound gains from an OEM intake manifold constructed from carbon fiber.

[Cronenberged]

I'm asking from a point of curiosity, not trying to pee in the Cheerios...

😅😂🤣

[Sprp85]

If the airbox is essentially a clone of the stock intake plenum, how does that impact sound? Seems to me it might make a modicum more noise (more resonance due to thinner carbon), but has this been done? I also get how different materials might produce a different tone, but is volume a goal here too?

Indeed. The most ideal result from this would be the sound gain you get from S65 carbon plenum vs. stock plenum. There is a significant volume & tone change with the carbon plenum. And I believe the carbon plenum for S65 do maintain stock-ish internals.

[S54Mickey]

Count me in. Been on the fence for the past 2 years. Straight plug and play would be a win win for me.

[Casa de Mesa]

So bizarre to me why people are irrationally afraid of proper tuning.

Agreed, tough sell but good luck.

Proper tuning is essential. Totally agree.

A few questions for the uninformed (me ):

If the airbox is essentially a clone of the stock intake plenum, how does that impact sound? Seems to me it might make a modicum more noise (more resonance due to thinner carbon), but has this been done? I also get how different materials might produce a different tone, but is volume a goal here too?

Here is my thinking. Perhaps a clone carbon box wouldn't have the same insulating properties as the stock one, but you wouldn't have the huge gaping hole sucking in air that you get with the CSL design. Sound is able to escape the CSL box pretty easily. With the clone, I can't imagine the induction noise would travel outside the confines of the stock air filter housing and associated plumbing any better than well... the stock plenum. It's bound to get trapped/muffled by the enclosures present with the factory airbox setup.

I'm asking from a point of curiosity, not trying to pee in the Cheerios...

[jet_dogg]

So bizarre to me why people are irrationally afraid of proper tuning.

Agreed, tough sell but good luck.

[Epoustouflant]

FYI, according to one of members in the other forum, the pricing got updated (Still a rough estimate) to 1,200 Euro.

That makes much more sense.

[maupineda]

I would do it and I already have a Karb CSL airbox. MAF tune is just more effective.

[WoGGo]

3,000 euros is the complete cost of a CSL airbox conversion including all the hardware & software, even for a pre facelift car.

From the Zpost thread:

The 3,000 euro comment from Karbonius is the cost to them to make the mould.

and...

Karbonius has provided a rough price: 1,200 Euro.