water injection for turbo usually use the pressurize air (boost) from turbo to "push" water from sealed water container (with controlled vent) to inlet pipe after air filter or turbo.
appropriate nozzle to make small mist of water droplets required to make sure it "blend" with intake air.
water injection benefit from colder air intake temperature and thus some power increment can be felt.
Well this was an interesting modification evo control arms and yes they do fit if you want to know how to do this you can pm me as i have not seen anyone do this before but i did lol