PDI Big Boss Stage 3 Performance Kit – Cummins X15 & ISX15 | SKU 715773

PDI Big Boss Stage 3 Performance Kit – Cummins X15 & ISX15

The PDI Big Boss Stage 3 Performance Kit is the flagship performance package for Cummins ISX15 and X15 engines. Designed to deliver maximum airflow, superior cooling, improved drivability, and enhanced engine efficiency, this complete system combines PDI's most advanced Big Boss components into one comprehensive upgrade package. The kit includes a Performance Tuner, Intake Manifold, Ceramic-Coated Exhaust Manifold, and Dual Oil Cooler to create the ultimate performance and reliability solution. :contentReference[oaicite:0]{index=0}

By improving both intake and exhaust flow while reducing oil temperatures, the Stage 3 Kit helps your engine breathe easier, operate cooler, and respond faster under load. Whether you're hauling heavy freight through mountain grades, operating in extreme temperatures, or simply looking to maximize engine efficiency, this package is designed to deliver measurable real-world results. :contentReference[oaicite:1]{index=1}

For owner-operators and fleets looking for the most complete Cummins performance upgrade available, the PDI Big Boss Stage 3 Package represents the pinnacle of airflow, cooling, and performance engineering. :contentReference[oaicite:2]{index=2}

What's Included

• PDI Big Boss Performance Tuner with Mount
• PDI Big Boss Intake Manifold
• PDI Big Boss Ceramic-Coated Exhaust Manifold
• PDI Big Boss Dual Oil Cooler
• Exhaust Manifold Installation Kit
• Stainless Spacer and Bolt Kit

Key Features

• Complete performance, airflow, and cooling package
• Designed for Cummins ISX15 and X15 engines
• Includes PDI Big Boss Performance Tuner
• Improves intake airflow efficiency
• Improves exhaust flow to the turbocharger
• Helps reduce turbo lag
• Lowers exhaust gas temperatures (EGTs)
• Reduces engine oil temperatures
• Improves throttle response and drivability
• Supports improved fuel economy and pulling power
• Made in the USA
• 1-Year Unlimited Mileage Warranty

Specifications

• Brand: PDI Performance Diesel
• Series: Big Boss™ Stage 3
• SKU: 715773
• Application: Cummins X15 & ISX15
• Engine Years: 2010–2024
• Warranty: 1 Year Unlimited Mileage Warranty
• Made In: USA

Applications

Compatible with Cummins X15 and ISX15 powered Peterbilt, Kenworth, Freightliner, Western Star, International, and Volvo trucks operating in long-haul, heavy-haul, vocational, and owner-operator applications. :contentReference[oaicite:3]{index=3}

Performance Benefits

• Maximum airflow improvement throughout the engine
• Improved turbocharger efficiency
• Reduced turbo lag
• Lower EGTs under heavy loads
• Reduced oil temperatures
• Enhanced throttle response
• Improved drivability and pulling power
• Potential fuel economy improvements
• Reduced thermal stress on engine components
• Enhanced long-term engine reliability

Why Choose the Stage 3 Kit?

Unlike individual performance upgrades, the Stage 3 Kit addresses every major airflow and cooling restriction within the engine system. The intake manifold improves incoming airflow, the exhaust manifold improves exhaust evacuation, the Dual Oil Cooler reduces oil temperatures, and the Big Boss Tuner optimizes engine performance. Together, these components create a balanced system engineered for maximum efficiency and reliability. :contentReference[oaicite:4]{index=4}

Why Choose PDI?

PDI Performance Diesel is one of the most trusted names in heavy-duty diesel performance. Their Big Boss product line is engineered specifically for commercial trucking applications and focuses on improving airflow, cooling efficiency, durability, and real-world performance. :contentReference[oaicite:5]{index=5}

Fitment Notice

Verify engine serial number (ESN) before ordering. Contact us with your ESN for fitment verification and product recommendations.