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I couldn't decide what to do for a year.Finally figured out I didn't want a piggy back tuner.So that left the TTS,SEST or the Tmax.No dyno with the Tmax so thats what I got.More money to start but should be less in the long run if I do any changes to the bike.A Super tuner is $450 from Harley.Not sure on the TTS.$750 for the Tmax.The TTS and SEST aren't autotune units.