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None at all.... I have used it before without issues.... Major things to be wary of are fairly simple.... Eg if injecting pre turbo you WILL wear compressor vanes over time.... And it's not needed to inject there for economy..
Also obviously if you tune for water and the system fails or you run out of water it's not good.... But similarly running out of diesel ain't such a good idea either..
In cold climates freezing can be an issue..
In hard water areas you have to use processed water.... And with bottled water 3 times more expensive than diesel it's a turn off...
Probably few more things.. And of course fear of the unknown... Lots of people will be worried injecting water into a diesel as they k ow how bad it is if it's in the diesel fuel tank..
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