There are not many pre-made kits for engines that size, they require quite a bit of water usually by the time someone is looking for water injection to bring EGTs back under control or they are looking to increase the power or economy of a heavy vechile.
The pros boiled down to all simply relate to a better combustion profile providing improvements.
The con is once you have set it to run with the water - if the water isn't there when expected the settings are such that serious engine damage can occur.
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