Performance Exhaust Manifold for Caterpillar C13 ACERT (2004.5–2010)

Fits: CAT C13 ACERT Engines – 2004.5 to 2010
OEM Reference Part #: 250-4409
CARB EO#: D-773-2 | Legal in All 50 States
Warranty: 2-Year Unlimited Mileage Warranty

Upgrade Your CAT C13 ACERT with the PDI Big Boss Exhaust Manifold

If you’re looking to unlock more performance from your Caterpillar C13 ACERT engine, the PDI Big Boss Exhaust Manifold is the upgrade your diesel needs. Designed specifically to replace OEM part number 250-4409, this manifold improves exhaust airflow by up to 20%, helping your turbo spool faster and your engine run cooler.

Whether you’re running long hauls, heavy-duty loads, or high-performance applications, this manifold reduces exhaust gas temperatures (EGTs) by 75–100°F, which helps protect vital engine components while improving efficiency.

Key Performance Benefits

• Up to 20% More Airflow Than OEM

• Lowers Exhaust Temps by 75–100°F

• Reduces Turbo Lag and Boosts Throttle Response

• Helps Improve Fuel Economy

• Street Legal – CARB Certified (EO# D-773-2)

• Proudly Made in the USA

Engineered for Strength, Built for Performance

Unlike factory cast manifolds that crack and warp under repeated heat cycles, the Big Boss Exhaust Manifold is crafted from High Silicon Molybdenum Ductile Iron (HSMD). This advanced material offers superior strength and thermal durability, virtually eliminating failures like warping, flaking, or center divider erosion.

Each port and runner is flow-tested to ensure balanced exhaust delivery to the turbocharger. The manifold’s geometry features gradual bends and smooth transitions that reduce internal turbulence and backpressure—allowing your engine to breathe freely and operate more efficiently.

A Smarter Aftermarket Upgrade

The CAT C13 ACERT Big Boss manifold isn’t just about horsepower—it’s about longevity, fuel efficiency, and reduced maintenance. Designed for perfect fitment and hassle-free installation, it’s a drop-in replacement for the OEM part and a long-term investment in your diesel engine’s health and performance.

Installation requires standard gaskets and hardware (not included).