The Airdog A4SPBD004 150 GPH Fuel System is the perfect choice for 5.9 Cummins 1998.5-2004 models. It offers a 150 GPH flow rate at 15-17 PSI, which is ideal for stock-800HP applications. This fuel system also removes air and water from your fuel, which increases horsepower and torque while optimizing engine performance. Additionally, it provides improved throttle response and increased fuel economy. Best of all, it comes with a lifetime limited express warranty for your peace of mind.