C.A.R.B legal way of boosting hp ??? In cali, there really is no such way. I live in the heart of Los Angeles and everything under my hood is not CARB legal except for the injen intake. Cops don't know what came stock or what didn't come stock. If you are extremely worried about staying "CARB legal" then get a Jackson Racing Supercharger bolt it on and be done with it. full spooling with a turbo and auto tranny doesn't take place right normally, so therefore, you will have a lot of problems.