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The TSX manifold will move your torque curve Higher in the RPM range.

I got that information from the Civic tuners forum.
\ I believe they port and polish the manifold as well.

There is some discussion about not doing the Polish. Some feel as though it spoils the natural turbulence. Diminishing fuel mix efficiency, therefor reducing engine output. They claim to have proven it with Dyno runs. However, there is no data posted to prove it.

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