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I have a vortech non intercooled and I'm more than satisfied with it, Im making 455rwhp at 8psi. Im getting the intercooler this month and incresing the PSI to 10.
Don't decide by brand, not yet anyway. Do some research into s/c technology first and decide which type (twin screw, roots, or centrifugal) best suits your needs and style of driving. Most users are biased and in love with the system they have and don't have any experience with any other. And while you're at it, to become fully informed with FI, you should take a peak at turbo.