PDI Big Boss Exhaust Manifold for Paccar MX13 Gen 1 (2010–2013)

OEM Ref: 1863537 | Made in the USA | 2-Year Unlimited Mile Warranty

Engine Compatibility

• Engine Make: Paccar

• Model: MX13 Gen 1

• Model Years: 2010, 2011, 2012, 2013

• OEM Reference #: 1863537

Performance Upgrade Overview

Unlock improved performance and long-lasting durability with the PDI Big Boss Exhaust Manifold for Paccar MX13 Gen 1 engines. Engineered for demanding on-road applications, this manifold offers a 20% increase in exhaust airflow over stock, contributing to lower Exhaust Gas Temperatures (EGTs) by up to 100°F and minimizing turbo lag.

Each manifold is dyno-tested and flow-bench validated to ensure balanced flow across all cylinders, helping reduce backpressure and maintain an optimal boost-to-exhaust pressure ratio—which can improve overall fuel economy and engine responsiveness.

Key Technical Benefits

• 20% More Airflow: Boosts engine breathing efficiency

• Cooler Exhaust Temps: Up to 100°F reduction in EGTs

• Faster Turbo Spool: Reduces lag and increases low-end power

• Balanced Port Flow: Enhances turbo efficiency and reliability

• Improved Mounting Design: Eliminates flange warping and gasket failure

Superior Material & Construction

Crafted from High Silicon with Molybdenum Ductile Iron (HSMD), this manifold resists the most common causes of failure in factory manifolds:

• No warping or cracking under thermal stress

• Resists center divider and flange erosion

• Ideal for heavy-duty, high-temperature environments

The updated mounting surface design eliminates manifold fatigue issues by reinforcing structural integrity, even under extended load cycles and extreme operating conditions.

Finish Options (if applicable)

If you’re offering this manifold in multiple finishes (Chrome, Black, or Raw Cast), you can include a breakdown like this: