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Yeah that I know (physically), I mean if you junked all that factory 70mm piping and went to a single 3"... would it then fit up in there?

Yes, the single on the HD makes a huge difference apparently from the few that have been smart enough to do it.
My friends 2500hd has pacesetters, ory and a GM performance catback for a 5.3 truck. :D
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