Questions about Powerdyne Chargers

OK,
My buddy called me up and ask me to help him install his powerdyne supercharger, i was like sure

anyway we got it installed no leaks that i could fine

we installed a FMU and Bypass Valve

he told me the kit is a 9psi kit, but we are only getting 5psi

the supercharge pulley is a 3" pulley and the crank pulley is the same size as the stock crank pulley

what psi kit is this

the supercharger aslo has there numbers on it
PD-11450

thanks
richie