Exhaust manifold design

[clarkoh]

I am about to build an SS manifold for my 4BT project. The turbo has the 2 port flange. When building the manifold, how far in should the divider between the 2 ports extend? The turbo flange will be centered and angled up about 45 degrees. I could split the manifold and have 2 cylinders feed each port or allow crossing between the 2. Is there any science to doing one or the other? Or a percentage of crossing over?

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[Ghostman]

If you plan on using a divided turbine housing I would setup the manifold to work with it.

 

[Hurley]

Pair 1&4, 2&3, and leave each volute completely separate from the other.

 

[clarkoh]

Roughed together. Turns out the turbo is not split. Sched10 ss pipe parts.

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