want performance? Go to a muffler and exhaust shop, have them custom-mandrel-bend 2.25-inch tubing for you, and use a Borla Supertrap muffler. It's gonna sound really raspy, but it'll do quite well for power.

want something shiney that looks good and claims to be the "highest output exhaust on the market"? Go with your original ideas. They all claim to be better, so pick one, get the look you want, and go for it.