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#5
Technically by Federal Law you are not allowed to relocate any emissions equipment on an vehicle that had emissions equipment from the factory. Long tube headers are specifically outlawed in California, you cannot get a CARB number for a long tube, so they can only be 49 state legal at most. Even if you didn't have to relocate cats they still wouldn't let you have them in Cali.
#7
Shorties and a good mandrel bent Y-pipe will flow almost as good as long tubes, but you won't get the benefit of the extra low end torque that long tubes get you. You'll make almost as good of high end HP numbers though. It's definitely worth it to replace the restrictive stock Y-pipe and manifolds, even if you can't go with long tubes.