No practical experience of using these, but I did get a price for one on my Hilux and for an FH460. I liked the idea you could adjust the increase in power yourself but didn’t go for it. I know people who have fitted these and had no issues, also people who had issues with burnt out valves. Didn’t want to take the risk with it.
I know these alter the injection time and not the injection pressure, but I’m still not sure about them.
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