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There seems to be lots of chatter about power upgrades with related subjects about intercooler changes, exhausts, air filters etc but has anyone thought about how to get more power and cooler air charge by simply installing water injection? Ideal mix is water methanol but water works too. This cools the intake charge and therefore allows higher boost and timing curves without the need for higher octane fuel. Son had a Gen V GTi VW years back with a tune and when he added the water kit without any software changes it made an immediate feel in performance more in the higher boost ranges. Cannot remember if the fuel economy changed but it was good on fuel even after the tune. He had a 94 octane tune but could safely run 91 while using the WI.
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