Mine sounds pretty similar to the SLP Loudmouth, even a lot of people said it sounds like an LS1 Car, Mustang, or right inbetween. But I also have the 4.8

I have Just stock Manifolds, no cats, Flowmaster Super 40 dualed out but with no echo tips (Kinda like dual split rear turn downs, old school muscle car style) , I took them off because it made it a bit more "poppy" and truck like.

Ive heard cowl327s truck in person on here, I dont know if hes modified it since, but it sounded like a camaro or a vette.