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There are a handful of decibel readings throughout this site. You would be surprised at the sound level difference between pipes. The cam in my car is pretty "lumpy" as you say, yet at idle, the car is very quiet (quiet being relative) at 78 decibels. Other cars at idle, with smaller cams, were considerably louder simply do to the sidepipes. However, when you get on the throttle, they are all going to be pretty damn loud. I don't consider my car in the realm of having to wear earplugs by any means though. The loudness factor between a cammed sbf and a Coyote is not going to be all that different when compared through the same exhaust.

If you want driveability and reliability, it's going to be pretty tough to beat a modern day fuel injected engine like the Coyote.