Gen III Eaton is on it's way. The pulley ratio is 1.12:1 to get 10#'s of boost. Guesstimating turbo will spool by ~2krpm. I'm using an M90 again but this time one with a built in bypass valve. It's a large supercharger for such a small displacement but it will also be only spinning 8400 rpm max. I think it will be happy with a 4 rib belt to drive it considering the size of the pulley. I need to start thinking about how I want to control the bypass valve.