I have never read a credible source that thought highly of water injection. Those who has read "Maximum Boost" may remember this quote "A Water injector on a turbo car is a poor-excuse band-aid for not doing the job correctly the first time." Food for thought. But sufice it to say there are probably no setups on this board that could really benifit from water injection even in theory. Oh and ca18guy I am pretty sure that you are mistaken about the water injection on the wrx's. I have seen spray kits for the intercoolers, perhaps that is what you are thinking about. Think about this as well it would only take a very small leak in the injector to destroy your motor. Yet another reason to stay away.
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