I see many people selling used Harley Davidson EFI race tuners ------ that WILL NOT WORK on your bike.

The first time the race tuner is connected to a bike - it marries to the ECU - this means you will only be able to tune the ECU on that bike- this is clearly stated in the users manual which you can download from the internet for FREE - do a search for Screamin Eagle EFI race tuner manual.

DON'T BUY A USED EFI RACE TUNER - IT WILL NOT WORK ON YOUR BIKE