Gorgeous. Expansion bellows and tig weld quality is top notch. Curious why you didn't design a conventional X-Pipe vs the barely cross talk u-pipes? I designed my own and realize it's a B--ch to shoe horn it in. Thanks for sharing.

 

Our cars don't really use a conventional type X setup cause the exhaust gases are running into each other not in parallel. IMO it's much better design to only merge them a bit and prevent hotspots. EB werks, this one and others do it. Most of the other designs are too much. IMO of course.

 

The conventional X is a flawed design which causes a restriction due the the gases crashing into each other at the X. This is evident by a heat rise as can be seen by the heavy blueing in the area of the X pictured below. This is NOT a design you want...

 

I'll post up video once the car is up and running. It'll be another month or so as it's getting an engine / gearbox refresh right now. Here are a couple of clips of my stainless 3" UW exhaust I've run the last 3 years.

 

This is a very subjective opinion and IMO misinformation based on our direct personal experience of building and testing thousands of X-Pipes over the past 10 years or so. For example, I have been running a 3" X-Pipe at the roughly 700HP level for many years with absolutely no signs of blueing at the center X area or anywhere else. I have seen lesser quality chinese metal blue like that, so I suspect the center X is fabricated from that type of steel. We use domestic stainless steel in all of our X-Pipes and never see blueing. We also do swaps for customers and our X-Pipe do not come back blue at the center. Obviously, it does get hotter at the center, as you have double the gasses at one area.

In terms of "NOT wanting that type of design", that is also a very subjective statement. We have learned that pulling the two banks apart, changes the character of the sound for the worse (our opinion) and the further apart, the more the sound resembles two 3 cylinder motors vs. the sweet sound of a truly blended exhaust note. Most exhaust customers are looking for the best sound and that is something we have found that can be created with the "X" and the "tip" design parameters, which we have refined to our goals.

Finally, our "X" design, which is similar to what you state people do not want makes over 40 AWHP more than the OEM exhaust on a modified car with just the exhaust swap.

So for anybody interested in an exhaust with epic sound that is capable of making serious power, there is more than one X design solution. And a 40 HP increase over OEM is about as much as I have ever heard of any exhaust making on the 996TT.

The only reason that I am responding to this is that being a vendor on this forum with thousands of extremely satisfied customers (read our testimonials - many are members here), I feel your carte blanche knocking of other X designs than yours is not necessarily in the best interest of all reading this thread and a very subjective opinion, therefore, I have offered my alternate opinion. I have heard several X-Pipes with the X separated like you tout and have not been impressed. IMO, every exhaust is different and has to be viewed independently.

 

You make fine exhausts John and clearly have many happy customers which is fantastic and commendable. I never said you didn’t and as such, there is need to get your feathered ruffled. I have no skin in the game and as an end user just stated an opinion based on my experience. The exhaust I pictured CLEARLY HAS DISCOLORATION FROM HEAT DISTRESS AS A RESULT OF the BOTTLENECK AT THE X, and I'll say it again, that particular design is NOT the one you want. It's not really rocket science there. I don't believe the exhaust pictured is one of yours anyway unless I'm mistaken.

If you talk to several different manufacturers they will all tout benefits of their design over the others. Clearly they can’t all be right but it’s innovation and the willingness to employ new ideas and designs to create the next better mouse trap. If that wasn’t the case we’d still all be driving the model T and flying on a DC3. It’s like that with every product in every industry whether you’re talking cars, aircraft, or whatever. If you don’t keep innovating then you’ll wake up one day and realize you’re one step behind.

Many people have different opinions and or recommendations on these and other forums. Many of these will obviously contradict each other. That’s the beauty of free thought and being able to share it with others so they can make up their own mind what is best for them. There are many ways to skin a cat, some perhaps better than others. It’s up to each individual to decide what is best for them. We can’t all be sheep.

 

Just look at the design. It's slamming the two banks into one another, it can't be that good. EB Werks is the ONLY exhaust I know of that was designed with actual software. Same setup, less of a merge. Again, when you keep the merge lower, you are more in line with a conventional setup as it starts to let the pipes run a tiny bit parallel. There's also no better sound (high pitched) .

 

Thanks and fine, I understand. There are differing methods and practices for a variety of results and tastes. It's all good.

 

You are entitled to your opinion, however, it supported this customers run of 9.89 @ 141.50 in the 1/4 mile...with our 3" X-Pipe. You don't see that too often.


https://www.6speedonline.com/article...mpaign=content

 

It's very simple to measure exhaust back pressure. So far I've only seen Stef at Europipe publish numbers but I've found that the smooth x merges are "decent" in flow and sound the best (less like a sewing machine with bad gas). N/A style merges run backwards with louvered core mufflers pointing into the flow...ehh, not so much but they sound good. Significant back pressure may not hurt top end power all that much to a certain extent, but a well designed, low back pressure system will move the boost threshold significantly to left and make larger turbo cars more responsive on the street and out of corners.

...and that UW exhaust deserves its own pedistal!

 

Not saying it doesn't work, but it's less than ideal. Guys aren't running 9s in P cars for lots of other reasons. Props to him though, car is flying.

 

I like your exhaust. It looks as if it's a perfectly designed product of outstanding quality. I hope you enjoy it.

Why does the pic of an exhaust that nobody should want look so familiar to me? Maybe because it's mine

That bad design is not loud, does drone only a very little in a very small bandwidth, as all exhausts do and finally is good for around 850 hp and a stable 4.25 100-200 km/h. I am pushing 1200 Nm thru it and it sounds beautifully. Very GT3ish and not like a tractor, as with all open exhausts (2x3 blowing in straight pipes)

The discoloration is a hint of more heat there, but it also just shows that this section gets fire from both sides. No big deal.

 

Didn't mean to turn this thread into a pissing contest. One poster asked about why a particular X design was chosen over the other and I chimed in. As I said before, all the various designs get the job done, some better than others. A 3” exhaust, even one with some bottlenecks will flow very well. If you’re happy with your exhaust, that’s what matters. If you are looking to minimize any localized bottlenecks/constraints which are evident by localized heat rise, then do your research. Find someone who is familiar with computational fluid dynamics and can shed some light on the various X designs. Better yet, have them run it though their modeling software. This will clearly tell you what is optimal without any BS or emotion.

 

I really don't think the "X" is a significant issue in this design - the center part of the exhaust has twice as much volume going past it as the other sections. To me, that means twice the heat and accounts for the colour. It does not suggest a problem with the flow - the cross section at that point is less restrictive than any other point in the pipe as well.

 

Me neither. The main purpose of my post was to congratulate you to your new exhaust and while you were picking on mine (no problem) replying to that. I am not defending anything here. It's an exhaust.