Congrats, would even get better times with something less restrictive like this: no choking, no hot spots > better performance.
cheers

 

I swapped to the Kline after something exactly like that (The Sharwerks with 200 cell/in Fabspeed cats).

It sounded like sh*t and resonated wildly in the car under 2000 rpm.

Given that I don't think I'm losing more than 2-5 hp from the X-pipe, I quite prefer a drivable car.

I try my best only to recommend exhausts that I've had on the car or driven a car with. Before you suggest something like the above, I'd ask you to drive a car for a day with one attached.

 

That thing has got to be unbearable..

 

My buddy has these sharkwerks pipes on his 991 tts and they do drone indeed but that doesn’t bother me one bit. I had the x-pipe 200 cell on my 997.2 tt and actually lost hp compared my previous 200 cell/stock muffler combo. that’s why I’m telling you the x is restrictive. Ok its not a 991 but engines are somewhat similar.

 

dixie, with respect to you and your buddy you do not have data or testing on this system. We have gone through it all. Also this is not the system you had. You are entitled to your opinion and to purchase anything you like. However, in my humble opinion without proof you are mis-informing people and it causes confusion for the community. Some people love to run with it further causing a disservice. Especially if you are going by the color of a 1d merge on a DI car that has over-run and shoots flames as well as builds up boost for launch control. There is a lot going on in that merge. Restriction and build up of back-pressure or loss of power are not any of them. The day someone proves that this system loses power over another I will buy that person any system they would like. There is a reason why several of the fastest 991's out run this system and hundreds of Kline customers are happy and performing amazingly. No power loss but actually even gains over other aftermarket systems.

Like I mentioned before...Every single high end exhaust system for this car and the factory have decided to cross over or turn the gases around one way or another in the center (there are many reasons for that by the way) and that area will in most cases show darker or more blue-ish in color. Unless it's a set of pipes that go from left to right like you shared in which case you can see that effect on the first bend right after the flange and that's with cats. Look right under your own car in the center Tuning or lack there of also can have a lot to do with fuel and overrun buildup as this also has to do with rich/lean conditions.

Enjoy whatever system you choose if at all. I just want everyone to be properly informed, assured and guaranteed on fact not opinion or unrelated bad experience.

Here are some simple examples that I just walked by while packaging orders today...



Thick gage cat bypass pipes that have no bluing at all on the first and hottest bend right out of the turbo charger.



An exhaust system that has some bluing on the exit from the canister furthest from the turbo, on its way out with no bend at all



A Kline with some miles on it off of a non-direct injected car that is more blue entering and exiting then it is at the merge




Here is diagram representing exhaust gas velocity and temp through the Kline system



A shot of the underbelly of a By Design Stage 4 producing 850 hp running our By Design/Kline Inconel system representing the heat signature coming off of the turbocharger on a thinner wall material versus the other pipes at the top.


And here's a beauty shot just because...Notice the manifolds here and above blue in different areas of the primaries and collector. Interesting and for reason.




Colors are fun...
Knowledge is power! If I can help you learn more about your car and a system that would make you happy I am mine is always open.

Cheers

 

I was going to say that looks like a sharks works set up, not much engineering in that. What the fastest 991 turbo with there system anybody know? do they have a car running 9's or 10.00?

 

I have sincerely expressed my concern about visceral’s exhaust and i’ve shared my own experience. Expressing an opinion and sharing a personal experience is stil part of this forum, nothing mis-leading at all. Amen

 

Double Amen to that. Just Sharing data and knowledge from years of collective experience. There's a lot to it. If I can ever help clarify anything for anyone or simply have the chance to stand behind the science/results I am ready and willing. I truly sympothise with your bad experience running that other system. Many friends and clients including myself have dealt with issues from a poor design or product mismatch. Whether it be HP, sound, drone or even product failure. Myself and my team are dedicated to our friends in the community! Always open to a friendly debate. I'm guilty of being passionate and chatty but it's sincere and I mean it from a good place willing and excited to help

 

Many of my friends with 991 Turbo S's in the New York run one of the Kline exhaust systems and all of them really like it. Not one has ever complained about a power loss or any
other issue.

 

Cheers Scott

 

Hi Guys

I wanted to write a reply to this thread for a while, but we’ve been so busy here with new development projects that were proving very time demanding.
So the question is, what is causing the heat discoloration on the x pipe? And are X pipes restrictive? Well the simple answer is, some x pipes are restrictive, and others not. Im not going to give examples of restrictive x pipes, so as not to undermine anyone, but I will explain the feature of the kline x pipe that sets it apart from most other x pipes.

The kline x pipe is a laminar flow x pipe, this means that when the gases meet, they are flowing analogous, or complementary, or co-linear to eachother. When blended in this way the exhaust gases are not opposing in force and wasting energy.

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And here is a computational fluid dynamics simulation of the x pipe


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The stock system has a chamber in the center which flows by the air entering displacing the air inside the chamber, forcing it through the exit. All of the inertia of the gas is lost, and requires additional energy/pressure generated by the engine to move the gas, this is pretty inefficient in terms of performance, but very useful for bass noise suppression and its quick and cheap to manufacture.

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Porsche have actually themselves begun using X pipes on their 991 carrera range, here’s a quick snap of the Porsche OEM X

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Exhaust gases are discharged in pulses that are like sin waves, when the exhaust valve opens, a high pressure pulse is emitted, followed by a low pressure region. If the exhaust gas velocity is optimum the low pressure region can actually be a vacuum, this is how scavenging works, but this is another subject altogether. (Something also that many people don’t know, is that there is a scavenge effect associated with turbo spool also, which explains turbo lag with oversized exhaust tubing).
Anyway, the point that I want to make, is that if the path lengths are equal, then the pulses in the x pipe meet 180 degrees out of phase, so each high pressure pulse is met by a low pressure region from the other bank

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Using this out of phase blending, the gases actually occupy less volume than before. This is the best way to blend the gases from opposing banks without causing restriction.

So where does the discolouration on the x pipe come from?
Well the x pipe does in fact heat up more quickly, and get hotter than the rest of the exhaust, but this is not due to restriction. The easiest way to think about it, is just that the heat from left and right banks are compounded. Or a slightly better way to understand it is that the frequency, or number of hot pulses passing through the x pipe is twice the number passing through the rest of the exhaust.

Have a little look at this animation I put together quickly to help with visualising this.


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Its one of those things that are kinda really obvious once you know!

The actual colour itself comes from a phenomenon known as “thin film interference”, where a very thin oxide layer is formed, which is partially transparent. Light reflecting off the oxide layer has a different path length to the light reflecting off the metal surface, and creates interference. The thickness of the oxide layer dictates the colour of the optical illusion.

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The F1 grade Inconel we use, is very inert, and so the oxide layer is very thin so it remains more transparent than stainless oxide, this is why the colouration is so intense, whereas stainless tends to just form a very thick oxide layer very quickly which is opaque brown.

Over time as the Inconel oxide layer gets a little thicker (we’re talking microns with Inconel) the colours change, and actually go through harmonics, so the silver turns to gold, then to dark blue, then light blue, then to a deeper gold, then back to blue, then light blue, then gold again. That’s why when you look at older Inconel exhausts, sometimes the blue appears lighter on the x than with a newer one, the oxide layer is thicker, but its gone through the harmonics.

Anyway, hope this answers all the questions anyone may have on the subject.
Thanks to all our customers for their support, and keep on enjoying the exhausts as much as we enjoy making them!!
Kline X pipe

 

Wow Amazing! This is the reason I would only utilize a Kline exhaust! Thanks Felix for the 101. The science is definitely more than just bending a few pipes.

 

And there you have it. I love that you guys share this with everyone to further understand and enjoy their choice/system.

For certain people I will just say knowledge is power

 

Awesome technology going into our systems...I have simple question Felix..is it possible to successfully paint (blk) the exposed inconel exhaust that can be seen from the rear of the car ?..just a thought tks

 

Couldn't agree more on the tech that goes into these systems.

I also love to blend things in, but it looks too dam cool to me👍