Sorry but you are TOTALLY AND COMPLETELY wrong on that one mate.

nitrous breaks down in a way similar to what you explained, water injection absolutely categorically does NOT.

Water injection lowers charge temps which means you can run more advance which can give small gains.
It also acts as a det surpressant.

VERY useful on a big boost turbo motor, utterly pointless on an N/A one though really.

A small nitrous kit like 25-50bhp wont do any harm to your car even if you drive with it engaged ALL the time if its jetted corretly.

But it WILL damage your pocket keep refilling it!


some headwork, cams, and a remap would see the sort of power you are after probably mate!