Delete
Make one
http://www.snowperformance.net/stage-2-dual-carb-roots-blower-boost-cooler.html (http://www.snowperformance.net/stage-2-dual-carb-roots-blower-boost-cooler.html)
Ok
What controller are you talking about? Hobbs switches are not $100. Are you making it for towing as a progressive kit or just a dual stage kit?
So just build one using Hobbs switches, simple, cheap, and easy.