I've been using one just like it for about six months. It is the same as the regular bullet style sporty muffler, just has that little fishtail welded on the back end. I changed over from the bullet style and didn't notice any difference with the performance or sound. To get a better exhaust note I ended up drilling a 3/8 hole in the baffle in both mufflers. If you are planning to switch over to a sporty muffler rejet the main to a 152.5. Since I've drilled the baffle the 152.5 main seems to run a little lean. I'm also using a K+N stock type air filter which contributes to the leaner condition.