For what it's worth my 02 came with full length duals and only cats to tone anything down. In a way that was good as I knew how to compare it to using a muffler. We put a Magnaflow dual in dual out 3". It splits off each side and has 4" stainless Magnaflow tips behind the rear wheels. The fit was very nice with lots of clearance all around.
Keep in mind I have the 8.1 and 6spd manual. On an idle it is fairly mellow, as soon as you accelarate it gets fairly mean sounding.
Most of the time when I shift it coughs or pops which I was hoping it would not do. At highway speeds it drones a bit. It is more than I wanted but as a bonus it puts the kids to sleeps very effectively. It has a wide open x chamber for both pipes to crossover.
One possible negative is depending on how the duals are run out the back will determine how or if your spare is going to fit under the truck after. Guess I need to make a bracket to hang mine on the front bumper.
