The 5" exhaust are not recommended for a close to stock truck, it tends to hurt the low end power a bit and really doesn't gain you any performance. A 4" mandrel bent exhaust is more than adequate for performance needs to well beyond 600 HP.
I think the drone is terrible on a straight thru exhaust, especially running loaded. A 5" exhaust is just that much worse. A 4" exhaust sans the CAT with a Aero Turbine was even more drone loaded than I cared to listen to. I added a 16" resonator and that made all the difference. It sounds really good at an idle, makes some noise when you get after it and there is literally no drone under load at speed. If you add a 5" tip it helps deepen the tone a bit. The dual resonators take the raspiness out that is the annoying sound of small block engine and straight exhaust.