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The stock turbos would definitely have a high emap considering how restrictive the manifold is. It would be difficult to have a fast spooling turbo with a low emap, since restriction is what really helps get the turbo moving. One day I'll check mine. I have a feeling the manifold back pressure won't be too bad in the compound setup since so much gets diverted around the first turbo once it is spooled and the wastegates open. The only issue is it will require multiple gates or a very large gate to divert say 600 hp worth of exhaust.
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