I would go with an H or X-pipe with high flow cats. It'll void your exhaust warranty, but who cares? You should see gains of anywhere from 8-12rwhp.
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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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