from my personal experience with my wrx, I say NO. I recently went to straight water from a 50/50 meth mix. I have had to back the timing Quite a bit, add fuel and lower boost. MY WRX does not like plain water much compared to methanol. I have a 18g turbo/fmic, afr's w/ meth were at 11.7:1. I'll be back to the dyno for some water only runs, but for now I'm on a street tune and it is definately not as strong.
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18G WRX 358whp
Aquamist 2d
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