20% OD Procharger Crank Pulley 3.7L V6 Mustang
This allows you to run a LARGER Procharger Pulley like a 4.10 and STILL be able to get the boost level as if you were running a 3.60 Procharger Pulley.
So what does it solve? NO MORE BELT SLIP! And the ability to make 600+ rwhp with a Procharger on the 11-17 3.7L V6 Mustang!
K060559 Belt for 3.70 Pulley