I did put down a good bit of sound deadener, but it was only because Im running hooker headers, 2 and 1/2 inch pipe, and dual borola mufflers mounted under the cab and them dumping out about 10 inches behind the rear of the cab. Once I put the wheel tubs in and the notch cover and sprayed the bed with Al's liner, it actually quieted down a little. The interior of the cab has a coat of bedliner, some peel n seal, and a layer of jute padding under custom carpet.
I can tell you though, i have NO PROBLEM hearing those duals sound off when I hit the go pedal, but cruising along I can roll the windows down and still hear the radio if I want and hear the rumble of the exhaust as well. Its great for cruising around town, but long trips it can be a little bit much. I just took a trip down to Tunica this past weekend, and I can tell you that on a 5 hour drive it is still music to your ears and do make time fly by, but I was ready to just sit somewhere quiet for a little bit once I got there. The sound wasnt annoying, but it was tiring on a long drive. Guess its a good thing most of my trips are not 5 or 6 hours all the time
I will keep my mean sounding exhaust and just deal with the 2 or 3 real long trips I take to shows in the summer.