RSX 500+ HP with Turbo

I was looking around the net and found a site many of you may have already come across. http://www.cybernationmotorsports.com/ They have several packaged Turbo kits for the RSX. I was wondering if this much HP is really possible out of an RSX without rebuilding the tranny, on the Stage 5 anyways. What if someone got a only a stage 2 or 3, how much additional work would need to be done on the car for the engine and tranny to handle this much of a boost. Are these guys just selling the kit? Then you get stuck with making your engine handle it? How much of the labor could be done yourself? Thought I would ask some experienced people in here. Tell me what you think.