The Type R Intake Manifold and the Skunk2 Intake Manifold are basically the same thing. And yes the manifold does add hp. From what I noticed it added the most power so far that I have put on my car. I only have a e/h/i/hi-flo cat, fuel rail and vtech controller and now intake manifold.

The manifold is a definite good power adder in my opinion. And it does give a different sound, nothing too different, but enough to notice. The sound sounds a little more deeper mainly becuase you are getting rid of the secondaries that open up at 5800rpm on a stock gsr manifold. On a itr or skunk2 manifold you won't have those secondaries and it won't sound as buzzy at high rpms any more.

But newayz the only 2 downfalls is 1. since you bought a aem cai to fit to a gsr manifold already then you would need a new one. Yes aem makes ones to fit to the new manifolds but it is a integra type R one which costs too much in my opinion. I simply just took my old aem cai that fit to my gsr manifold and kinda rigged it up to fit to my new skunk2 manifold. Eventually I will buy more piping to run it back down as a Cold air intake but for now its a short ram.

The second downfall, which isn't really a down fall is that you lose low end power from this and gain much high end power. You will really feel it pull one you hit about 6 grand all the way to the red line. When I first nailed it after putting the manifold on I hit the rev limiter a couple times because I wasn't used to the added high end power. Anyways sorry for the long story here just thought I'd give you all the details. Anymore questions let me know.