The XDP Race Fuel Valve prevents fuel from being returned to the tank when the pressure release valve is opened due to fuel rail pressure increases. Many high performance electronic tuning devices raise the fuel rail pressure resulting in P0087 & P1011 codes on Cummins engines and P1093 codes on Duramax engines. Once installed you should notice the codes no longer being displayed and no more loss of power.
The Garrett PowerMax GT3788VA turbocharger is machined differently than your OEM turbo and has a much lesser likelihood over the factory turbo.
The Garrett GT3788VA Turbocharger will increase turbine efficiency as well as engine performance. Beings the turbo is larger than stock we highly recommended that additional fueling upgrades such as aftermarket tuning be installed or already in use. With the proper supporting modifications, conservative driving habits and a more thorough fuel burn, fuel economy increases are to be expected.
All that is recommended is the Ford Turbo Bolt/O-ring Kit - XDP Part Number: FO3C3Z-9T514-AG.