Welcome to the forum, I have the Magnaflow which like the previous posts is similar in setup to the stock, but uses a 3" pipe and the muffler is about 50% smaller, meaning less weight. It sounds pretty good but with a Solo Performance high flow CAT, it sounds awesome. Not much HP increase with the Magnaflow exhaust but there is a significant sound change. The magnaflow combined with a Solo CAT = 15hp gain. Add a Westers Garage Tune and you have an additional 45-50 HP gain.