The JRSC for the 5th gen will fit in the 4th gen engine bay. Here are a couple of things to consider. You'll have more power potential with turbo. At the same amount of boost a turbo will be more powerfull with an intercooler. Intercooler options with the JRSC are far more limited than a turbo. Getting sleeves, forged pistons and rods will not net you any more power at the same or lowered compression, the point of these items is to make your engine stronger as ludeboom was basically saying. The advanage of a supercharger over a turbo is that the power is always there where as a turbo you have to wait for spool time, but again the most power gains can be realized by a turbo setup. The JRSC is made for the H22A4 so it will fit on any H22 engine. There is some modification you have to do to the drivers side shock tower for fittment but it is minor.