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Take a piece of paper and make an outline of the manifold and turbo mounting surfaces, match them up to the adapter plate and trace with a marker or etching pen. The mount the plate to the manifold and use an airtool with a carbide tip to ream out and smooth the passage into the manifold, then place it on the exhaust section (remove that from the rest of the turbo) and die grind it from the other side.
That wil give you the best possible passage between the 2. I am anal with that shit and like smooth flow with as little turbulence as possible. You can also clean up the exhaust mani with the grinder tool - get rid of some of the cast crap.
regards,
Louis
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