ProOPR Rising Rate Turbo Oil Pressure Regulator (Twin Outlet)Turbosmart ProOPR is a rising rate oil pressure regulator for your turbocharger. The ProOPR is boost referenced, not unlike your fuel pressure regulator and allows lower oil pressure at lower boost pressures and increases oil supply pressure to the bearing system at higher boost levels. This is designed for large turbocharger systems and high boost levels where the additional pressure and confidence is required at high boost, high shaft speed and