PDI Big Boss Cummins X15 EPA21 High HP In-Frame Kit

The PDI Big Boss Cummins X15 EPA21 High HP In-Frame Kit is a complete, heavy-duty engine rebuild solution designed for precision, durability, and high-performance output in Cummins X15 EPA21 high-horsepower engines. Engineered to meet or exceed OEM standards, this kit provides the critical components needed to restore or enhance engine reliability, compression, and power for the latest generation of X15 platforms.

Each Big Boss In-Frame Kit includes premium pistons, liners, rings, bearings, gaskets, and seals—all manufactured from high-strength, heat-resistant materials for maximum performance under extreme operating pressures and temperatures. Optimized for high-horsepower configurations, the kit improves combustion efficiency, reduces friction, and maintains smooth operation for extended service life.

Ideal for professional rebuilds, fleet upgrades, and performance applications, the PDI Big Boss Cummins X15 EPA21 High HP In-Frame Kit delivers the proven power, precision, and durability that diesel specialists and operators rely on from the Big Boss line.