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Speed Engineering was the only company that I could find them at. I think they sell them on eBay too.
Unfortunately for me, I live in a province with the emissions testing. My truck has two catalytic converters one on each side of the engine. I don't know how I could relocate them.
We just launched part numbers for an 1 7/8" header for the 07-13 5.3, 6.0 and 6.2 trucks. Unfortunately the only one that it fits to a factory exhaust is a 5.3 truck but you can get our system with an X-pipe to fabricate to a dual exhaust. Product looks roughly like the one pictured below. Let me know if you have any questions.