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Old 12-05-2016, 09:40 AM   #1
Scooby Newbie
Member#: 296728
Join Date: Oct 2011
Chapter/Region: Tri-State
Location: Long Island, NY
2004 Sti

Default turbo manifold primary diameter theory

Im in need of someone with experience regarding turbo manifold diameter theory. I was going to port my exahust ports to match whatever manifold diameter I run with. I can not find anything for theories regarding turbo cars. Most of the info is on N/A cars with formulas to figure out runner diameter based on peak rpm and displacement on that cylinder. I don't think this applies to turbo.

My setup will be high revving engine, twin scroll 6766 and I need to figure out what the diameter of my manifold primaries will be so I can wrap up my heads. I will be fabricating the manifold btw.
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