Right now I have all the Stg4 stuff except for a bigger intercooler, but I have found an APS DR500 with a bung already tapped for water injection. I had thought about using W/I in the past, but wondered if there was any point doing it with my VF23. I don't want to go to a bigger turbo because this thing is so much fun around town. That, and because my little 23 spools up so quick I can easily take out cars with VF30/34's and some sort of aftermarket I/C. I am using UTEC for my engine management. Would there be any significant gain from adding the water injection down the road? I would have it dyno tuned, of course.