Just to be candid, I have the Hooker slip ons and the sound is very good.
2 things that I'm not happy about

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1st with the stock head pipes the Hookers do a bunch of pop and rumble on decel and evryone I have asked has said they have it also with stock headers, so I don't think your going to tune it out at least not with a carb maybe with EFI I'm not sure

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2nd if you run with the right pipe open and the left one closed to maximize the HP (like a poor mans 2-1) then they pop and rumble more on decel and with the majority of the exhaust through the right muffler it seems logical to me at least that you should and will have some discoloration on that muffler

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Just my 2 cents...wish someone would of shared that when I was asking.