"Offroad H-pipe" generally means no cats, so if you put cats on it it's not really an offroad pipe anymore. Basically, it's illegal to change your cats unless they are damaged or not functioning properly, period. I think that technically in CA even alot of the pipes sold with cats are not actually legal unless they have a CARB exemption number. You should check the laws where you're at as they vary a little bit from state to state.
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Strike down the unroadworthy!
2000 GT Atl. Blue: '03 Cobra motor - 465rwhp/473rwtq, T-56 6-speed, full MM TA/PH & tubular K-member suspension, Saleen body, 17" Torq-Thrust II's, M/T ET Street radials, and lots more
'94 Rio Red Cobra: All the bolt-ons, 3.73s
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