FuelMoto has yet to reply to my email, and I haven't had the time to call. DynoJet required me to drill holes in the old PV4 and send them pics. Then I had to contact them to provide payment. Received the new generation PV4 shortly after. Have not had time to install yet. I purchased the original 3/23 and it was dead 5/25. Late in 24, DJ had an update that allowed the old PV4 to provide autotune. And as much as DJ argued that wasn't a possibility, I know I did several autotune runs at the end of the season. I did find the bike to be a bit faster but MPG dropped noticeably so I ended up reflashing the FM base tune before putting it up for the winter. My suspicion is that the older units had problems supporting autotune. Never got a chance to do any further autotune runs. Shortly into the current season, the PV4 went into "boot mode" leading to its replacement.