MaxxForce low pressure turbo B3RS 13879880004 front view

B3RS 13879880004 Low Pressure Turbocharger for MaxxForce 11 13 15

Name: B3RS 13879880004 Low Pressure Turbocharger for MaxxForce 11 13 15
Brand: MaxxForce
SKU: 13879880004

The B3RS (13879880004) is the BorgWarner low-pressure turbocharger in the twin-turbo system used on the International Navistar MaxxForce 11, 13, and 15 engines. This is the larger turbo in the compound system — it receives exhaust after the B2XG high-pressure turbo and provides additional airflow at higher RPM and load. BorgWarner part 13879880004, International OEM 3005700C93. Built new, dynamically balanced, ships with gaskets. We supply shops, fleets, and distributors.

Turbo Model

B3RS / B3NS (BorgWarner, low-pressure side of twin-turbo system)

OEM / Interchange Numbers

13879880004

Application

2003-2012 International ProStar, MaxxForce 11/13/15 (I783, I766)

Service & Support

1-Year Unlimited-Mileage Warranty
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FAQ

The B3RS (13879880004) fits the International Navistar MaxxForce 11, 13, and 15 engines in 2003-2012 International ProStar and other trucks.

Low pressure. The B3RS is the larger, outer turbo that provides high-RPM airflow. It receives exhaust after the high-pressure B2XG.

The B2XG (12709880008) is the matching high-pressure turbo.

Brand new, dynamically balanced. No core charge. One-year unlimited-mileage warranty.

Yes. US stock, volume pricing for shops, fleets, and distributors.

B3RS Low-Pressure Turbo for MaxxForce: The Outer Turbo

The B3RS is the low-pressure (LP) side of the MaxxForce compound twin-turbo system. It is the outer, larger turbo that provides high-RPM airflow volume. When diagnosing twin-turbo issues on the MaxxForce, the LP turbo typically fails from oil seal issues or bearing wear, while the HP turbo (B2XG) is more prone to VGT vane sticking.