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

Replaces OEM Part #: 2124730 | Built in the USA | Backed by 2-Year Unlimited Mile Warranty

Compatible With:

Engine Make: Paccar

Engine Model: MX13

Model Years: 2017 to 2024

OEM Reference Number: 2124730

Performance Overview

Looking to improve your Paccar MX13’s power and efficiency? The PDI Big Boss Exhaust Manifold is the upgrade you need. Designed for long-haul reliability and high-performance output, this manifold delivers a 20% increase in exhaust airflow, helping lower exhaust gas temperatures (EGTs) by up to 100°F, reduce turbo lag, and optimize boost response.

Whether you’re pulling heavy loads or maximizing fuel economy, the precision-balanced port flow design ensures even distribution of exhaust gases to the turbocharger, giving you smoother power delivery and greater thermal control under stress.

Key Features & Technical Benefits

+20% Average Airflow Increase
Boosts engine breathing efficiency, reduces exhaust restriction

Up to 100°F Lower EGTs
Protects turbo components and improves combustion

Faster Turbo Response
Reduced lag, smoother acceleration under load

High Silicon Moly Ductile Iron (HSMD)
Heat-resistant casting prevents cracking, warping, and center divider failure

Redesigned Mounting Surfaces
Eliminates common flange fatigue and gasket blowout

Superior Materials & Engineering

PDI utilizes HSMD (High Silicon with Molybdenum Ductile Iron)—a superior alloy specifically engineered to withstand thermal cycling, heavy-duty vibrations, and corrosive exhaust conditions. Unlike stock manifolds, this material:

Prevents thermal warping

Reduces heat-related erosion

Increases structural integrity under extreme loads

Combined with a refined port layout and strengthened mounting points, this manifold provides long-term reliability in demanding fleet or owner-operator applications.

Direct Bolt-On Replacement

Replaces OEM #: 2124730

Fitment: 2017–2024 Paccar MX13 engines

Installation Time: Approx. 3–4 hours

No modifications required – uses factory mounting locations

Optional: Hardware and gasket kit (check product package)

Warranty & Support

Coverage: 2-Year / Unlimited Miles

Manufactured & Assembled in the USA

Support: Expert assistance from PDI’s U.S.-based team

Why Choose Heavy Duty Kits?

At Heavy Duty Kits, we’re committed to supplying proven performance parts that go the extra mile. We only offer brands like PDI that deliver measurable improvements in power, reliability, and efficiency. With fast shipping, knowledgeable support, and direct OEM replacements, we help you keep your truck running longer and stronger.