Karbonius Carbon Fibre Stock S54 Plenum

[antknee]

i ran an AFE intake for years, and until i recently installed an Eventuri (got one used for cheap) so i said why not. Wasn't expecting much of a difference at all.....and was totally wrong. Huge difference. I would put it right smack in the middle, between a K&N/AFE cone filter & a true CSL airbox.

Under normal driving it sounds exactly the same as stock, but under load it really has that deep throaty sound....similar to CSL.

I really want to hear a difference between this Karbonus Stock CF unit + with & without an Eventuri setup, just to hear the difference between the two.

[Tbonem3]

Do they often go on sale for that price point? I didn’t see any during BF this year.

My friend got one in the 700 range for BF last year. I didn't see what prices were this year.

[JDMaflac]

Honestly, the Eventuri alone is enough to scratch that itch (esp if you retain the stock muffler) and can't/don't want to deal with the software/smog/MOT aspect. Get it on sale for about $7xx-800 and be done.

Do they often go on sale for that price point? I didn’t see any during BF this year.

[Slideways]

A bummer if true. I miss the sound of my old CSL box, just not all the headaches that come with it.

What headaches did your setup have? Hopefully it was not the drivability/tuning cause a modern CSL tune on the MSS54HP should perform just like stock.

[maupineda]

Honestly, the Eventuri alone is enough to scratch that itch (esp if you retain the stock muffler) and can't/don't want to deal with the software/smog/MOT aspect. Get it on sale for about $7xx-800 and be done.

yes and no, the tone and warble is just not the same.

[heinzboehmer]

A bummer if true. I miss the sound of my old CSL box, just not all the headaches that come with it.

CSL airboxes don't really have any issues if you do them correctly (CSL DME firmware, MAP sensor and tune for your specific setup)

[Tbonem3]

Honestly, the Eventuri alone is enough to scratch that itch (esp if you retain the stock muffler) and can't/don't want to deal with the software/smog/MOT aspect. Get it on sale for about $7xx-800 and be done.

[maupineda]

A bummer if true. I miss the sound of my old CSL box, just not all the headaches that come with it.

Check the video links provides. With an eventuri it sounds like the CSL.

[EYEHAVEYOU]

Based on the videos that were posted, IMO that combo still sound like every cold air intake, albeit slightly deeper with the Karb OEM Plenum. It is not nearly as brutal sounding as the full CSL.

A bummer if true. I miss the sound of my old CSL box, just not all the headaches that come with it.

[Slideways]

Curious to hear impressions from those who are running everything stock besides this new Karb piece - wondering if you need a wide opening like with that eventuri to get something approach CSL sound or not.

Based on the videos that were posted, IMO that combo still sound like every cold air intake, albeit slightly deeper with the Karb OEM Plenum. It is not nearly as brutal sounding as the full CSL.

[EthanolTurbo]

Curious to hear impressions from those who are running everything stock besides this new Karb piece - wondering if you need a wide opening like with that eventuri to get something approach CSL sound or not.

Yes, you do.

[EYEHAVEYOU]

Curious to hear impressions from those who are running everything stock besides this new Karb piece - wondering if you need a wide opening like with that eventuri to get something approach CSL sound or not.

[ruffy dongles]

Chiming in to say I ordered this 11/3 and it arrived 11/22. Impulse purchase looking for a hint of CSL sound, no good reason. I was not on the priority list initiated here. Install to follow in a few weeks.

[humarahumara]

anyone have a coupon code they aren't planning to use? Please Pm me.

[TeddybearCup]

My idle control valve hose to intake manifold had been getting loose because I snapped the locking ring during install, so ordered this piece here to replace the fitting https://www.amazon.com/dp/B07Y34Q4FZ...roduct_details
Just made a guess the end was the same size and lo and behold it was.

Went on a test drive and holy hell, the intake REALLY came alive today! so much louder than before.

I took some video of it for my records and compared them against clips. I realized something that has been happening:
I think my phone auto adjusts volume during recording.
Comparing OEM manifold vs Karbonius (with the loose hose end) and then finally Karbonius with fixed new hose end and fresh O ring on the videos, they all were similar loudness in videos, but tone did change, in the sense that the bassier notes, from the exhaust, got less with each vid.
I'm no sound engineer, so asked a friend for ideas, and he suggested I use a low pass filter to isolate non intake sounds.

Video as it came out of my phone

Video with a 150hz low pass filter, showing the road and exhaust rumble more. Can see proportionally, those frequencies dropped off a ton with the air leak fixed aka proportionally a lot less of the sound generated, since this time, the intake was way louder than everything else.

EDIT:
Had wife plus friend from autocross verify, just to make sure I'm not just deep in some placebo effect here.

Next up, I'm making my own intake setup reusing the OEM boot with a resin printed maf housing, cf velocity stack, and 9 inch filter.