Update,
Took about 20 minutes to remove the old exhaust and install the Hole Shot Vortex. I didn't do anything else to it...no air box mods and didn't rejet. All I got to say upon first test ride is... SSSHWWEEETT!!!! This thing sounds awsome and the front end picks up with little more than a thought in 1st and now it comes up in 2nd too! I'm almost scared to install the stage II kit but I know it's coming...just can't help myself. Lets just say that I'm very satisfied with the product.