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Old Apr 26th 2018, 04:36 PM   #1
Phl
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V4 stock exhaust

That bread box is worse than on the diavel.

Got it cut up to analyze the routing. There might be an option with cat bypassing and directly running out.


But its gonna be a heck of a job...

The alternative is in the making though
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Old Apr 26th 2018, 04:45 PM   #2
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Pics!!!
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Old Apr 26th 2018, 06:45 PM   #3
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Coming soon


Vertical cylinders header comes down through cat to front chamber where valve is
Front cylinders header comes from front against a wall into front chamber

Front chamber goes into middle chamber through valve passage

When valve is closed, exhaust gases have to take bypass pipe into rear chamber that is perforated towards middle chamber.

Side exits come out of middle chamber


There is a lot going on and it’s clear it’s not efficient.

So, even a shitty aftermarket solution will likely produce gains.

Not posting pics right now, too many butchers out there that want to make sammiches with free bread and their bologny

Last edited by Phl; Apr 27th 2018 at 02:07 AM.
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Old Apr 27th 2018, 04:10 AM   #4
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Sounds like a major mess. That dough will never rise that way.
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Old Apr 27th 2018, 08:33 PM   #5
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It arrived safely? The mufflers surprisingly is one piece... Looks like a lot of work to port it.

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Old Apr 28th 2018, 08:17 AM   #6
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Originally Posted by Nitrouz View Post
It arrived safely? The mufflers surprisingly is one piece... Looks like a lot of work to port it.

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Yes, thanks!
Yes, some damage, they were in the box with the headers and a few loose sheets of bubble wrap.

Irrelevant for the surgery. As of now a core and pipe insert job looks like 12h...

But i already have another idea...
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Old Apr 28th 2018, 05:08 PM   #7
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Photos please. Collectively, I'm sure we can generate flow ideas.
The biggest challenge of course is the plumbing and the welding.

Last edited by DarR; Apr 28th 2018 at 05:17 PM.
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Old May 11th 2018, 04:03 AM   #8
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bump for update
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Old May 11th 2018, 04:19 AM   #9
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Originally Posted by DarR View Post
Photos please. Collectively, I'm sure we can generate flow ideas.
The biggest challenge of course is the plumbing and the welding.
No way would he upload photos, people would just copy his design.
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Old May 11th 2018, 05:21 AM   #10
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Will do when finished
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