ok guys need opinions for my exhaust manifold set up.

Suprapowaz!(2)

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Apr 10, 2006
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San Antonio, Tx.
I have a precision turbo 62e .60a/r compressor & .69a/r T4 on center turbine side.
I was looking in to getting one of those Megan Racing SS manifolds when the revised one was done and in store. I have another route i'm looking at taking. Thought about having MDCmotorsports me make a T4 adapter with external WG flange for my stock manifold. Question is how far horsepower-wise has someone taken the stock manifold? At what point does the stock manifold become a restriction? Or should I just go with a tubular manifold from the get go? Any thoughts or opinions?