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Just take the cat pipes off and do a Stage I. I know at least two dealers that will do it around here and said there are no restrictions from HD about it.
FWIW, my "other bike" has a catalytic converter on it and the bike tops out at 142 and gets there, like, right now. Apparently it likes the ***** cat....
I would say that the cats would rob a few HP on the theory that a free flowing exhaust adds HP, then a restriction such as cats would do just the opposite.
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