If you don't have to worry about the emissions test I would say get an off road H-X pipe, you might loose a little low end torque like 5 ft. lbs. but the sound is way worth it!!! Anyway the off road pipes make there power at the top end and isn't that where that 4.6's make theres also?? Ah we have a nothe variable here!! Go with the off-road!
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87 Gt with 4 inch cowl hood, dark charcole grey, long tube headers,off road h-pipe, 2 chamber flows,BBK cold air intake, Mass air coversion(ported stock MAF), 1 intake spacer, Hypertech superchip, MAC underdrive pulleys,Pro 5.0 shifter, and a King Cobra clutch,Crane adjustable fuel press. regulator, Mac Strut and Tower Brace. Powertrax locker, 4.10's (new for this season)
Best time 14.91
Best MPH 103
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