go directly to Skunk2's webpage and look into their cookbook.
Off the top of my head if your asking about tunner series, then:
Stage 1 are direct replacement, and no upgraded valvetrain required. Slight cam profile but nothing aggresive.
Stage 2 req. valvetrain upgrade along with compression. Normalish low-cam profile and bigger high-cam profile. These things scream VTEC, i love mine!
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STAGE KIDS
Re-Birth '09
Progression Is Beautiful