Torque storm super charger

I think the first step is figuring out what you want to build. How much hp is your goal? Bolting 5 psi onto a stock 318 will be pretty disappointing. I think a very loose generalization is 15 psi will double the n/a power output. So if you make 250 hp n/a add 15 psi you get 500 hp assuming tuning is worked out , heads can flow that much etc etc. So a 250 hp 318 with 5psi may only put out an extra 80hp. A 330 hp Supercharged 318 would be pretty disappointing given the expense and work involved. Keep researching...