Getting a more muscle sound out of a 6

My Slant6 is running a Super Six set up and exhausts through Hooker headers 3 into 1, dual aluminized 2.25” custom built pipes w/ “H” pipe then through glass pack mufflers for ea. side to the back exiting through Cuda style bright tips. I think it sounds pretty throaty to me. When people are listening to it at idle they’ll swear it a V8, until I open the hood. All this wrapped up in a bright Orange ‘70 Challenger body really gets the questions started.