I'm still a bit sceptical about hydrogen cleaning, A friend of mine was convinced the cleaning would sort out his DPF issues, but a few months later they were back and he had to take it to a real garage to get it fixed properly.
I drove the car fairly regularly, both before and after the treatment, and it did feel more responsive afterward, and being generally sceptical I was fairly surprised that I noticed a difference. But it didn't last for long before it was back to how it was before the cleaning.
I'm not sure about whether the performance boost was due to the 'cleaning', or whether running a car with hydrogen mixed in along with the fuel/air is going to affect the readings on the engine sensors and the ECU will attempt to adjust the fuel trims to compensate, possibly giving a short boost in performance until the fuel trims settle back to normal.
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