I would agree you need cam upgrades to make the RBC work. Also, you'll gain top end HP with the RBC and lose torque. See Hondata's dyno of the RBC vs RBB(TSX) on their web site and the k20a.org post.
http://www.k20a.org/forum/showthread.php?t=27207
http://www.hondata.com/tuning_k24a2_tsx_engine.html
Quote: "The purple line involved only one change, from the long RBB intake manifold - to the short Accord Euro R RBC intake manifold. This manifold has shorter and larger diameter runners than the RBB intake. It is well optimized for high RPM breathing. A gain of 2-3 HP from 6200 RPM to the redline though is not enough to offset the loss of torque pretty much everywhere under 6000 RPM for this engine setup."
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