Acquamist on a Golf IV 1.6 105HP (gasoline)

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Hi everybody... I'd like to install the Acquamist system on my ordinary car, in order to save gasoline during my many travels. Could anyone give me some advice?
-Is the system effective and affordable for my purpose? The exhaust system will be damaged?
-What size of injector should I use, and the quantity of water per minute? ...I'm not interested injecting methanol.
-What kind of pump should I install, and so, how much current is supplied to it?

Thank you for your help...