I had a 4" MBRP on my LLY with straight pipe and no muffler. I loved that truck and the sound it produced. I wish this truck sounded like that. Like I said though, I don't know if I could handle the truck if I didn't have the muffler on it, I think it would be very annoying. With the muffler is alright. It's not terrible at highway speeds, just make sure the radio is on and don't focus on the truck and you'll be okay.
I am thinking of purchasing an MBRP or aFe tip in hopes that it will change the sound of the exhaust slightly and make it sound better. It's not loud enough for my liking at idle
It almost purrs at idle and doesn't sound like a diesel is why I say that.