s14 calipers fit straight on, but with s14 discs being wider you could do with spacers behind the pads to stop the pistons popping out when the pads get low, 10 psi is about right without an intercooler, 12 to 14 psi with, but get it checked out on a dyno, rob on here runs 16psi on a t3 with cossie i/c, get a cheap 5th injector set up and a pressure switch, then you can set the injector to come on when the afr starts to lean out, a crude method but works for cheap.
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 fj20/et a replacement for displacement 
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