355 The “Ultimate” F355 Exhaust system. Kreissieg (it wins).

Are there any good quality vids of the howling KSG? How’s it compare to Cap 3?


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OEM headers +hi flow cat - Tubi muffller is more high pitched than same setup with Tubi headers at high RMP. Tubi headers make it sound more mellow across the RPM range and at idle it's a nice rumble, at least to me. Just did ab0ut 100 miles today. Even got to 7500 RPM.

 

Very interesting -- what in the exhaust unleashed 12-15hp, and especially what in the intake offers up 40hp?

 

I have the Kreissieg exhaust on my 355, along with Fabspeed headers. The previous owner, who was an FChat member, put it on a number of years ago.

It’s insane, and in a good way. The best way I can describe it is that it actually sounds like the OEM exhaust, just turned up to 11. It’s a very high pitched sound, very similar to an old F1 car.

There’s a switch in the center console that can open/close the valving. With the valves “closed”, it works like the OEM exhaust, where depending on throttle position and RPM, the valves may open up. But I do find that the engine doesn’t feel as “free spinning” with the valves closed; either it’s my imagination because of lack of sound, or there’s some excessive back pressure.

It IS loud, but not “drone-y” like a Tubi. However, you don’t want to drive for long distances with those valves open, or your hearing will suffer.

After driving my car, Chris Perkins from Road & Track wrote this article about the 355 sound: https://12ft.io/proxy?q=https://www.roadandtrack.com/news/a43805754/ferrari-f355-exhaust-sound/

 

Velocity stack length and (exponential) taper 6-8 HP--length is long by about 1cm, exponential taper is a bit off compared to 3D CFD simulations mid 2000s (10 years after the F355 was put into production).
RET_Bellmouth_Sept.pdf (profblairandassociates.com)

Placing something akin to a Quart jar on the top of the velocity stack ducted into the Helmholtz resonator adds ~25 HP. Velocity stack feeds off quart jar which feeds off Helmholtz resonator serving 4 cylinders. A resonator in a resonator.

Sizing the Helmholtz resonator properly is the last 5 HP.

Noting inside the engine was changed including port sizes, although the headers had a 7º taper from the 38mm port area to the 41mm ID of the pipes.

 

Kreissieg, high pitched but not drone-y, exactly. Also don't sound like a boat at idle. Same on the 348 or so I have heard.

 

Are there any pictures of this setup?


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Which KSG do you have? How does it compare to Cap 3?


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Capristo sound like motorboats at idle especially, too deep in my humble opinion.

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The ultimate is a bit out of reach for me, is the “Howling” a higher octave than capristo as well?


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The entire pitch of KSG is higher across the entire line even before the valves open from the ones I have heard at least. Would you be happy with it? hard to say, best to not buy an exhaust without hearing it or your expectations can be violated. "I thought it would be higher pitched, people said it was this or that I think its more this or that etc et etc"

 

That’s the conundrum, no idea how to hear one first lol


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Exactly, no amount of forum dialog will resolve that. Take the plunge based on what you "hear" people say or buy a Capristo. Same as it always is.

People are funny, "what about the 1800 to 2400 rpm range in the 800-3500 hz range is there a large present spike in low mids lets say toward 900 or is it more skewed toward 2500? Any idea on the decibel break out by frequency at every 200 hz intervals compared to brand X? Someone should buy every exhaust and do that test and publish that detail at multiple rpm levels with inexpensive and professional equipment to compare results between equipment types too."

 

My only apprehension is that the design just looks like it’s a straight pipe at the bypass. Almost every company offers a similar bypass setup with the excel of Tubi evo and Capristo and from what I can tell is that a straight-through system doesn’t give the harmonic required to hit that F1 shriek.

If it’s the y-pipe responsible, why not just run the KSG spiral pipe with any exhaust?


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https://www.instagram.com/p/B33HRXfJndp/?igshid=NjZiM2M3MzIxNA==

 

The mufflers sound different for tooling around town too, In the end its not JUST abut WOT F1 shriek but that seems to get the focus. The KSG just sound better tooling around town, to my ears at least, KSG that sounds sticks in your memory.

Not better btw just different in a better way, I believe more livable as well. Lots of options, people get what they like not everyone likes the same thing.

 

Some exhaust still flows through the primary cats and muffler box, where some the magic happens. This affects the overall sound the system produces. Same reason why the Armytrix muffler doesn’t sound like KSG .

 

I suspected that might be the case. This car is like tuning a damn instrument lol. I’ll see if I can swing for a KSG when the time comes. I was originally thinking OEM headers, test pipes, spiral Y pipe, and Capristo would be the winning combo


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There’s a reason why an S-Line X-pipe, KSG X-pipe, and Kline X-pipe all sound different on a 430 and 458. Because some exhaust is still flowing thru the muffler and that’s enough to affect the tone. Whereas S-Line (non valved) has no muffler and produces a very different… louder & raspier sound compared to a system with a muffler box.


Kline mufflers produce clean/smooth F1 sound. KSG produces more raw F1 sound. S-line (non valved) is a ruckus. Loud and ear-splitting. Alot of people love it though. Personally, KSG has been the best balance.


Moral of the story? Design of the muffler box matters. One could do challenge style straight thru with no muffler box on a 355…chances are you won’t like the sound.

 

I liked car #1 the best on all passes by a lot. Car #6 was the worst. But it Was a good test since all measurement were made the same way. 31 sound like a car. The others sound like chain saws.

One thing I will point out is the obvious difference between the rear recording and in car. Not such a big difference with a spider.

 

Car #1 was stock.


Car # 6 is S-Line. No muffler.


I liked Car #5, which is the Kline system.


I believe #6 and #5 are the two most popular systems sold in the U.S.