PDI Big Boss Exhaust Manifold for Paccar MX13 (2017–2024)

OEM Ref: 2124729 | Made in the USA | 2-Year Unlimited Mile Warranty

Engine Compatibility

Engine Make: Paccar

Engine Model: MX13

Model Years: 2017 through 2024

OEM Reference Part #: 2124729

Overview – Performance You Can Feel

The PDI Big Boss Exhaust Manifold for Paccar MX13 (2017–2024) delivers a significant upgrade in airflow and durability over factory stock manifolds. Designed with precision to reduce turbo lag, improve throttle response, and lower exhaust gas temperatures (EGTs), this manifold is an essential bolt-on solution for serious performance enhancement and long-term reliability.

By improving exhaust scavenging and balancing flow to the turbocharger, this manifold increases airflow by 20% and helps reduce EGTs by up to 100°F, which translates to better turbo efficiency, more pulling power, and improved fuel economy.

Key Technical Benefits

+20% Airflow in Key Areas
Increases exhaust velocity and reduces restriction

Cooler EGTs (Up to 100°F)
Protects turbo and engine components under heavy load

Faster Turbo Spool-Up
Balanced flow design minimizes lag and maximizes responsiveness

Stronger, Smarter Casting
High Silicon Molybdenum Ductile Iron resists cracking, fatigue, and heat erosion

Optimized Mounting Surfaces
Prevents gasket failure and flange warping in high-temperature cycles

Premium Material & Construction

Manufactured using HSMD (High Silicon with Molybdenum Ductile Iron), this manifold is engineered to withstand extreme temperature cycles and heavy-duty use. Compared to stock castings, this material significantly enhances:

Thermal resistance

Structural integrity

Resistance to cracking and erosion in the center divider and flange areas

PDI also re-engineered the mounting flanges and port geometry to eliminate uneven stress points and ensure long-term reliability—even under continuous heavy loads.

OEM Direct Replacement

Replaces OEM Part #: 2124729

Fits: Paccar MX13 Engines (2017–2024)

No modifications required – direct bolt-on install

Installation Time: Approx. 3–4 hours with basic tools

Warranty & Support

2-Year Unlimited Mileage Warranty

Built and tested in the USA

Dedicated technical support from PDI experts

Why Buy From Heavy Duty Kits?

At Heavy Duty Kits, we specialize in performance diesel parts built to outlast and outperform factory components. With fast shipping, expert support, and a curated catalog of trusted brands like PDI, we help fleets and independent drivers get the most out of every mile.