I had the same setup with 370cc's, a walboro 317, and a slew of feul and ignition add-ons. I could never get it under a 13.8, to save my life. I also had the 8lb pulley, and a CRV pulley, for a total boost of 10-11 lbs. IMO, and I am not trying to bash, sell the blower and kit on E-bay, and...