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

The PDI Big Boss Cummins X15 EPA21 Low HP In-Frame Kit is a complete, premium-quality rebuild solution engineered to restore efficiency, power, and reliability in Cummins X15 EPA21 low-horsepower engines. Built to PDI’s industry-leading standards, this in-frame kit provides all the components required for a professional-grade engine overhaul with precision fitment and long-lasting durability.

Each Big Boss In-Frame Kit includes pistons, liners, rings, bearings, gaskets, and seals, all manufactured from high-strength, heat- and pressure-resistant materials to withstand the demands of modern diesel performance. Optimized for EPA21 low-HP applications, this kit improves compression, reduces oil consumption, and maintains consistent performance across extended duty cycles.

Ideal for professional rebuilds, fleet maintenance, and performance restorations, the PDI Big Boss Cummins X15 EPA21 Low HP In-Frame Kit delivers the exceptional reliability, quality, and precision engineering that define PDI’s Big Boss product line.