RX 1 supercharger

[Silverbullet]

I think you can get a smaller pulley for the S/C and run 4 or 5 pounds of boost This way you can get by on 91 all day long

 

[bjniceguy]

Stage one comes with pulleys that are for 10 LB, but just reversed order are for 5 LB. You have to buy different pulleys to get 7 Lb. All pretty staright forward.
Doug

 

[Bossman]

What you can do is add head gaskets to lower your compression so 10 lbs of boost will be no problem.

 

[KbxSrx]

you order the pulleys with the kit that you want for the specific application, 7 or 10 lbs.
You dont need to go into the engine for 10 lbs, just run race gas