Try Me,
Check down a couple of posts. 97ScottieGT kind of went through the same thing as you. The MIL eliminators fool the computer into thinking everything is ok in the absence of cats. I guess it has something to do with the difference in air velocity that the free flowing pipe provides. They most likely won't come with a new H or X pipe but previous posts will give you a couple of links were to purchase them. I think Hammer said
www.DallasMustang.com has them.
You'll have to let me know how everything turns out with the new pipe. An H pipe is going to be one of next mods and our 4.6's are the first generation modulars so gains should be comparable.
Stefan
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66 Standard coupe
200 inline 6 - Pertronix ignition, Flamethrower Coil, K&N, Clifford Perf. 6 into 2 headers, Holley carb, three row radiator, Firestone Firehawk 215/60R14's
96 GT Convertible
Bosch Platinum +4 plugs, B&M Ripper, Borla Side exhaust,
K&N, removed air silencer, Tokico struts/ shocks, BF Goodrich Comp T/A 245/50 16's
Next up: 3:73's, high flow H-Pipe