I would recommend searching around on here before you go throwing more money at the truck. A lot of people have gone through what you are going through now, in the past and tried many different things before finding what they like/or a way to eleviate the problem........tuner..........
I would do that before trying to reinvent the wheel. It will save you a lot a of time, money and aggrevation. Oh and welcome to the forum it's a great resource to learn about our trucks.
Try searching "MDS" Hypertch" Superchips" MDS deactivation"
Or if you want to keep MDS try searching for exhaust set-ups that others have tried (some with audio clips) and liked.