I obviously wouldn't return it if it is installed and working efficiently. I would believe the later model R3s to be where the ECU changes were made. Just not sure which ones...and neither is Dobek, lol! If I knew when Dobek made the decision to stop production, we might be within a year of the culprit year model...maybe. I sure would like to have one. I am headed to Birmingham, AL this weekend to have a Dyno tuner that uses TuneECU help me work through AFR issues. He said he has tuned a few Triumphs and feels confident that he can get it leaned out on the fuel tables. Fingers crossed that it works out well. After RamAir, DP exhaust, and Hanso Tune, it is running quite rich. I didn't know how hard it would be to find a shop with TuneECU experience in my area.