The cat X-pipe is illegal because any modification of a properly working emissions system is illegal. Out here in the east, technically its illegal, but as long as you pass the sniffer, they don't care. And rightfully so, whats the difference if you pass w/ one cat or four, a blown cat or a coffee can, as long as you exhaust is "clean."
I had an offroad X-pipe on my 5.0L and I thought the sound and upper end power was nothing short of awsome. X-pipes work best w/ a straight through muffler though, like a race magnum or Magnaflows, thats the way it was designed. If you have a chambered or baffled muffler, and are gonna run "cats", I would save money and run an H-pipe. W/ cats and those mufflers, there is next to no difference between an X and H. The H will sound deeper or more "bass", while X will have more of a Nascar sound.
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1997 Thunderbird 4.6L, just bought, this thing has just about every option, let the mods begin
Recently totaled (tear): 91 LX 5.0L 5 spd Red w/ black interior
2 chamber flowmasters, Bassani off-road X-pipe, MAC cold air induction, Kirban short throw, Heavy duty 3 core radiator, FMS 3:73's, Timing bump to 14 degrees, SRP billet racing pedals, Kenwood sound system
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