@1olbull Steve, it's pretty straightforward -- TuneECU is doing just that -- working directly with the ECU. The ECU -- ours anyway -- do not have a functionality where where it can be changed in real time while it is running. This is in contrast with PCV or any other piggyback system for that matter - the ECU is still running, doing its thing, while the piggyback is actually telling the motor what to do, so the piggy back can be adjusted in real time while the motor is running, whereas the ECU being adjusted cannot be adjusted in real time, so necessarily takes longer.