This was a product we came across as a necessity for our MZR platform engines with increased oil pressure at higher RPM areas. A turbocharger like the EFR and Garrett series that are "Self Restricted" depend on predictable oil pressures, the MZR and Duratec engines are unique in the sense that they produce relatively high pressures. This is the solution! Anything over 50-60psi will be bled off from your supply line. A great match for those of you running our EFR bottom mount NC kit!