I wanted to get that deep "throaty" exhaust sound but had only limited money on hand to do so. I decided to just replace the stock muffler with a flowmaster 40's series muffler. I gotta say, the sound is just what I was looking for. It cost me 150 bucks total at a local exhaust shop here in Hawaii. As a bonus, My truck has better acceleration and I am getting about 2-3 miles more out of a gallon of gas.