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Discussion Starter · #1 ·
I think that I want to move my turbos up front to get them in a better possition.
They are B/W S491 turbos from Bullseye with the S6 flange 1.45AR.
The header pipes ar 2 1/8" outside = 2" inside
If I build a new set of headers facing forward and move the turbos up front, what size to use in between the headers and turbo flange ?
Will a 3" do the job or will it need a 3.5" pipe ?
Motor is at 505cui on methanl with aprox 3000hp @ 40psi.....

Picture of motor with the old manifold and 88mm turbos, but the headers are the same.
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