As far as tuning, I have a MAF from a 460 V8 that is just over 3" in diameter. I also am using low impedence injectors from a 2.2 turbo, low impedence injectors work better for forced inductions applications and in general as the injector gets bigger. I am also running an SAFC2 which the cars computer hasn't relearned. I also have an aeromotive FPR with a 1:1 rising rate to add one pound of fuel pressure for every pund of boost. Th MAF should detect the extra incoming air. When I ran a data logger it only showed 3 volts max at WOT. As for the Intake temp sensor I am going to place that after the turbo and before the intercooler so the computer thinks the air is hotter then it is so that it will retard the timing some.

ATX MTX swap, rear drum disc swap, drilled rotors, ported intake, optim throttle body, CAI, 7.5L MAF, adj. fuel regulator, longtube headers, underdrive pulley, no EGR, low inpedence bigger injectors, 2002 Focus Swap