It sounds like you are wanting to keep the loud sound but deaden the noise to an engine sound correct? You might give SpinTech mufflers a look. They have some OUTSTANDING sound if you want to be able to hear the truck yet it deadens the sound to an exhaust tone. I personally have no experience with the dynomax but figured I would give ya some options.
Spin Tech Mufflers
I have ran the Pro-Street series and all I can say is WOW!! If you want a little more quiet the Sportsman Street XL might catch your eye.
Again, just throwing out options.
Brett