Air to water setups are great for high boost setups and rear/mid engine cars. Look at
www.frozenboost.com if you are a DIYer or want to fab a setup. I've bought a lot of stuff from them on their coupler and AN fittings side. Oh, and piping.
Good group of folks out of Colorado. Nice and central for quick shipping! They also took care of me when some of the fittings I got split on me when trying to fab my lines. Coulda been me, coulda been the fitting/line, but they just took care of it.