The Vortech kit for the GSR suffers from the same problem as the JRSC which is a lack of an intercooler. You would more easily be able to adapt an intercooler of some sort to the kit than a JRSC, but it's still a non intercooled system.

You keep asking all these random questions that are pretty vague, I suggest that you figure out how fast you want to go with how much money you have to spend and how much of a chance of blowing up your motor you're willing to take. From there, people can suggest setups rather than giving their feedback on assorted random topics.