Well, since you said legal, I would have to say a high flow cat H pipe and 1 or 2 chamber Flowmasters. Nothing too loud, but about as good as its gonna get with cats. If you don't have emissions or visual inspection for cats, go with an offroad H-pipe and 2 chamber Flows. 1 chamber Flows will be too damn loud and will make you sound like a ricer since you won't be running 11's or anything.
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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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