I have long ago given up on manufactures adsand their claimed HP gains.
"The 96-98 gt's are terribly choked by the exhaust..."
I think you mean terribly choked by small, bad flowing exhaust ports in the head. They are restricted no more then any other Mustang. In fact, since they have the same 2 1/4" setup that the the 99+GT's have, you would assume that the newer GT's have a more restricted setup since they have a higher output engine requiring more breathing.
I meant exactly what I said. Don't tell people they will gain 20-30peak HP on a stock GT from H-pipe and catback install. Thats it.
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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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