1) Either. ALTHOUGH the EP setup literally bolts right up with no modification, where as the RSX JRSC kit sits differently, and therefore you may have to modify the rad/headlight support structure to clear the pulley. The benefit to running the RSX version is the ability to run an aftercooler which is beneficial for several reasons.
2) Again Either. ALTHOUGH I'm 99% sure Comptech's kit was designed solely for the RSX, therefore it sits like the RSX JRSC kit. They are also more expensive as well and harder to come by.
3) PSI is solely determined by the user and what you are trying to achieve power wise, while retaining reliability. The amount of PSI is attained by utilizing different supercharger and crank pulleys. Its a bit of a science, depending on what setup you are running, to achieve the ideal psi for your setup. I'd say 7-9psi is the average, any higher than that you better start looking into alternative forms of cooling.
4) Why would the same supercharged k20a2 in a RSX make different power in an EP? Granted everything is the same in terms of setup, expect to make similar, if not identical numbers. I'd say 300whp is a safe and attainable goal with a blown a2.
I am by no means an expert, but I hope I shed some light on a couple things. I'm sure some of the big supercharger guys can chime in here.
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