I have verified my 180 high flow stat is fully opening with the pot of water on the stove method prior to installing. I did some research on overdriven pulleys and found the only way to get anything overdriven was to change the entire pulley set up to serpentine like the CVF 1:20 set up as the stock overdriven pulleys are super hard to find. I figured I would try the stock non AC Pulley I had as that wasn't really in the budget at the time.