@Sergey Since I sit right at 12,000 lbs, I am basically driving like I am towing everywhere. I have wondered if I would be quieter without my weight, being that I would need less pedal to get around.
I just have a glass pack on my dually. I probably weigh about half of what you do. The glass pack really isn't that loud.... Until I'm trying to pull a loaded trailer up a grade which gets old fast.
I know where you're coming from and yes, I think if the extra weight wasn't there you probably wouldn't mind it.
I plan on a straight pipe once I turbo it, because I've heard how much a turbo will tone it down, plus mine is currently dumped right under the bed, and the new exhaust will let out behind the tire where it's supposed to be which should reduce a lot of the drone.
I also don't live in the city where people will complain about my noisy smelly truck, so there's that