ThunderMax 309-485 ECU Harley Dyna 04-11 Sportster 11-13 Models Inc XR1200Harley Davidson Dyna Sportster ThunderMax 309 485 Zippers ECU upgrade This amazing auto tuning with wide band sensors easy setup tunes your bike as you ride no dyno needed! put in rough base map with pc and go for a ride! cooler running better MPG more power and adjustable tickover means a huge improvement and better than any add on fp3 etc ! no matter what you duo to the bike it will adapt the mapping , also now Harley Davidson are discontinuing the
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