+ + , ah heck I +1000 that. Kind of what I was going to get to once we knew which brand DJ it was. As I said the DynoJet requires widening of the holes in the Carbs with a drill (all drill bits provided though) where the Factory Pro tunning kit I believe just has couple sets of needles and clips. If you really want the bike to run true and the best of it's ability then I would take Lizard up, and get the name of the person with a dyno, as that is the only way to get them set where they need to be for the bike. Because even though you put the kits in they may need to be taken out and adjusted.