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The only way to know for sure is to get it tested on a dynamometer. Next best is to find someone with an identical (or at least similar) setup, and look at their dyno curves - it shouldn't be hard to find some online.
You have to watch out for the manufacturer's claims.. the headers say they add 20hp, the intake 5, the chip 15, and suddenly you think the car has jumped from it's stock 170hp to 250!
Here's the secret of how they do it without actually lying: Take a fully set up and tuned up car - totally tweaked out. Then re-install the stock exhaust manifold, and dyno it. Now add your gee-whiz header, and look, it went up 20HP! Just by adding the one part!
Another thing to look at is the torque curve. Often, the HP numbers look good but there's only any torque for a short peak over a narrow and very high rpm. Remember, HP = torque x rpm, so many people feel it's best to have your torque happen up high. But there's an old saying in the biz... "HP sells engines, but torque wins races"
Actually I'd be interested in those numbers too, I'm shopping for an Integra.
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