Got my Dynomax VT system installed today (this system has the flapper built into the muffler). It is everything I expected! It has a nice low rumble when idling but a nice growl if you mash the pedal. Everyday V8 driving is not much louder than stock, but the tone is better. Everyday V4 driving is not as quiet as stock, but very very very little drone. Basically, if you're training your ear to hear it, then you'll notice it but if your wife or girlfriend got in the truck, she wouldn't even notice. Overall, I am extremely pleased as for me, this is the perfect combination of sound and loudness.
Here are some pics and keep in mind that I have a 1.5" body lift on the truck, so the exhaust and tailpipe are a little more exposed than you would normally see.