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CSG touring is the easy answer as they designed it around people using it with catless setups.
Perrin is pretty good too, I've driven a friends setup with a Perrin 3", stock front pipe and two different UEL headers and it doesn't drone. Reasonably loud but livable.
I tried a greddy SP with catless UEL headers and stock front pipe. While it was quiet, it droned quite badly.
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