As someone with a Sport GT and coming from a 20 sport.
I assure you the exhaust sounds MUCH different and better. When I was at the dealer, they had a sport gt, Laramie GT and rebel gt(none were custom ordered). They all sounded the exact same. A very nice growl on start, and I couldnt hear my standard ram idling next to the GT.
Anyone who says they are the same as a non GT exhaust wasn't listening to a GT.
However, I don't know how people say the intake makes it sound different. That's something I can't notice.
I would take pictures of my muffler etc, but it's been snowing and -40 since I bought the truck last month.
Chose the Sport because I dislike the rebel grill and no ventilated seats.