I don't think you will have any issues with a T6 vs T4 manifold.
Your turbo already has a T6 housing so I don't see a reason to run an adapter from a T4 manifold to bump it to T6.
You'd probably lose a small amount of HP just because of the flow turbulence going up from a T4 on your manifold up to the T6 flange on your turbo.
Engine dyno testing has shown the Steed Speed Standard T6 flange manifold to be nearly identical in horsepower to an ATS 3 Piece with MJ tool's high flow center section, but doing it with less back pressure.
I run the T6 standard plenum on Black Ice and it works very well.
I honestly don't think there is a need for the Competition Header at your HP and RPM level, other than to say "mines bigger" (manifold wise).
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