Well, what's your complete current setup?
I'm not on top of the game game when it comes to knowing the 99+ GT's returnless fuel system, but if I was throwing the 9psi on a stock block, I would run: 42# injectors, 90mm Lightning MAF, 255 fuel pump or equivilant for the 99+ cars (I think the returnless guys go with the '03 cobra pumps or dual focus pumps,) and a Superchips Custom Tuning dyno tune or at the least a custom chip. I would also think about locating the IAT (or ACT) sensor in one of the intake runners.
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'97 T-bird LX 4.6L 2V, auto
SVO heads/intake, Vortech T-trim, front mounted intercooler, blower cams, Cobra crank, Manley H-beam rods, JE pistons, Aeromotive fuel system w/ 42# injectors, and much more
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