Kit Includes :    Available for: 2010 - 2021 Cummins ISX15 & X15 Engines Warranty: 1 Year Unlimited Mile Warranty PDI Big Boss Performance Packages are put together with performance, efficiency, and savings in mind. The Stage 2 Performance Kit combines the popular Big Boss tuner with both our high performing intake and manifolds deliver the best mileage and pulling power while balancing air flow to and from the engine. As direct replacement products they are simple to install and utilize all factory hardware. Save now by ordering in a single kit instead of individually!