hey guys need a little help i just got a D1SC twin high flow 12 rib pulley setup i wanted 10lb boost the 12 rib pulley they gave me says 4.25 on the face of the pulley is that right to see 10lb boost ....by the way its a 89 gta l98 350 totaly stock except for 24lb injectors thanks

I'am using a 4" pulley on a 12 rib setup and it's giving me 10 psi at 5500 RPM's and 12 at 6k.