hope its ok if I chime in on this question... I have had a few bikes with the cobra tuner and all of them it was a big difference and the bike ran perfect. I just bought a 2010 SG that had air cleaner and exhaust mods with I believe only a stage one download from dealer and it ran ok but stumbled off idle a bit. I installed the cobra and after a few miles for the tuner to learn problem solved it runs and starts perfect every time.