So if I unplugg the controller it won't spray but what about the vaccum hose thats hooked up will that hurt anything engine wise? Also what would be better for more HP meth or alky. Not sure what to do 100% or 50/50. Not sure what the snow pump will take heard 100% meth hurts pump not sure about alky. I have to order meth unless I run washer fluid. I can get alky for $4.75 a gallon.2005 wrx 20g 7cm all suporting mods. Anyone tried both to see hp differances?