i just got my p1-sc back from procharger and is now a d1-sc and i need to know what pulley size (in inches) i need to make 18-21 psi. i also heard that if you get a 16-18 psi pulley and get a bigger underdrive pulley you will make over 20 psi . i need to figure out how to make 20 psi for my new longblock to have full power. please help
