PDI Big Boss Compound Turbo Kit – Cummins X15 & ISX15 | SKU 141715895041

PDI Big Boss Compound Turbo Kit – Cummins X15 & ISX15

The PDI Big Boss Compound Turbo Kit is the ultimate turbocharger upgrade for Cummins ISX15 and X15 engines. Engineered for serious owner-operators, performance enthusiasts, and heavy-haul applications, this twin turbo system is designed to dramatically improve airflow, increase horsepower potential, reduce exhaust gas temperatures, and enhance overall engine efficiency. The system is built to support applications producing 550–700 horsepower while maintaining excellent drivability and reliability.

Unlike a conventional single turbo setup, the PDI Big Boss Compound System utilizes both a high-pressure and low-pressure turbocharger working together to deliver increased airflow throughout the entire RPM range. This results in faster spool-up, improved boost response, lower EGTs, and stronger pulling power under heavy loads.

Whether you're climbing mountain grades, hauling oversized loads, or simply looking for maximum performance from your Cummins engine, the PDI Big Boss Compound Kit provides one of the most effective airflow upgrades available for the ISX15 and X15 platform. :contentReference[oaicite:0]{index=0}

Key Features

• Complete compound twin turbocharger system
• Designed for Cummins ISX15 and X15 engines
• Supports 550–700 horsepower applications
• Improves airflow throughout the RPM range
• Reduces turbo lag
• Improves throttle response
• Lowers exhaust gas temperatures (EGTs)
• Increases boost efficiency
• Built for heavy-duty commercial trucking applications
• Designed to maximize engine performance and reliability
• Made in the USA

Specifications

• Brand: PDI Performance Diesel
• Series: Big Boss™ Compound System
• SKU: 141715895041
• Application: Cummins ISX15 & X15
• Engine Years: 2010–2020
• Horsepower Capability: 550–700 HP
• Turbo Configuration: Compound Twin Turbo System
• Warranty: 1 Year Unlimited Mileage Warranty

Applications

Compatible with Cummins ISX15 and X15 powered Peterbilt, Kenworth, Freightliner, Western Star, International, and Volvo trucks operating in long-haul, heavy-haul, vocational, agricultural, and performance applications. :contentReference[oaicite:1]{index=1}

Performance Benefits

• Supports 550–700 horsepower builds
• Significantly improved airflow capacity
• Faster turbo spool-up
• Reduced turbo lag
• Lower exhaust gas temperatures
• Improved fuel efficiency potential
• Enhanced pulling power under load
• Improved engine responsiveness
• Better overall turbocharger efficiency
• Reduced thermal stress on engine components

Why Upgrade to Compound Turbos?

A compound turbo system allows two turbochargers to work together, delivering higher airflow volumes while maintaining strong low-end response. The smaller turbo provides quick spool-up and immediate throttle response, while the larger turbo delivers the airflow needed to support higher horsepower levels and sustained performance under heavy loads.

This design helps improve boost control, reduce exhaust temperatures, and create a broader powerband than a traditional single turbocharger setup.

Built for Serious Cummins Performance

The PDI Big Boss Compound Kit is designed for operators who demand maximum performance from their ISX15 or X15 engine. When paired with other Big Boss airflow products such as the Intake Manifold, Exhaust Manifold, and Performance Tuner, the system helps unlock the full performance potential of the Cummins platform. :contentReference[oaicite:2]{index=2}

Why Choose PDI?

PDI Performance Diesel is one of the most respected names in heavy-duty diesel performance. Their Big Boss product line is engineered specifically for commercial trucking applications, delivering measurable improvements in airflow, cooling efficiency, durability, and real-world performance. :contentReference[oaicite:3]{index=3}

Fitment Notice

Verify engine serial number (ESN) before ordering. This kit is designed for 2010–2020 Cummins ISX15 and X15 engines. Contact us for fitment verification and installation recommendations.