Product Description
BORG WARNER 178788 S400SX Turbine Housing 87MM 1.00 A/R T4 (Divided)
The BorgWarner 178788 S400SX Turbine Housing 87MM 1.00 A/R T4 (Divided) is a genuine AirWerks S400 turbine housing engineered for high-performance diesel and racing applications requiring an optimal balance of spool-up, drive pressure control, and top-end airflow. Designed specifically for S400SX and S400SX-E turbochargers utilizing an 87mm turbine wheel, this housing features a 1.00 A/R twin-scroll T4 inlet and a Half Marmon 4.62-inch outlet for excellent exhaust flow and turbine efficiency.
Built from high-strength cast iron, the BorgWarner 178788 is a popular upgrade for Cummins, Duramax, Power Stroke, and custom turbocharged applications where improved turbine response and power delivery are critical. The twin-scroll divided volute design helps maintain exhaust pulse energy while supporting excellent high-rpm performance in both street and competition environments.
Features
- Genuine BorgWarner AirWerks S400SX turbine housing
- Designed for S400SX and S400SX-E turbochargers
- Fits 87mm turbine wheel applications
- 1.00 A/R turbine housing
- T4 divided twin-scroll inlet design
- Half Marmon 4.62-inch outlet connection
- High-strength cast iron construction
- Excellent balance of spool-up and top-end airflow
- Improves exhaust pulse energy and turbine efficiency
- Ideal for street, racing, pulling, and compound turbo applications
- OEM-quality BorgWarner durability
Fitment
- BorgWarner AirWerks S400SX turbochargers
- BorgWarner AirWerks S400SX-E turbochargers
- 87mm S400 turbine wheel applications
- Cummins performance builds
- Duramax performance builds
- Power Stroke performance builds
- Single turbo systems
- Compound turbocharger systems
- Drag racing applications
- Sled pulling applications
- Custom turbocharged performance projects
Note: Verify turbine wheel size, turbine housing flange configuration, downpipe connection, and turbocharger compatibility before ordering. This housing is designed for S400-series turbochargers utilizing an 87mm turbine wheel and a divided T4 manifold setup.
What's Included
- BorgWarner 178788 S400SX Turbine Housing
- 1.00 A/R Divided T4 Twin-Scroll Housing
- Factory Cast-Iron Turbine Housing Assembly
Specifications
- Manufacturer: BorgWarner
- Part Number: 178788
- Product Type: Turbine Housing
- Turbocharger Series: AirWerks S400SX / S400SX-E
- Turbine Wheel Compatibility: 87mm
- Turbine Housing A/R: 1.00
- Inlet Flange: T4 Divided (Twin-Scroll)
- Outlet Style: Half Marmon 4.62 Inch
- Material: Cast Iron
- Volute Design: Twin-Scroll / Divided
- Application: High-Performance Diesel and Racing
Cross Reference Numbers
178788, 178787, 178789, 178790, S400SX 87mm Housing, S400SX-E 87mm Housing, BorgWarner 1.00 A/R T4 Divided Housing
FAQ
What turbochargers does the BorgWarner 178788 fit?
This housing is designed for BorgWarner S400SX and S400SX-E turbochargers utilizing an 87mm turbine wheel. Always verify your turbocharger specifications before ordering.
What are the advantages of a 1.00 A/R turbine housing?
A 1.00 A/R housing provides an excellent compromise between turbocharger response and top-end airflow, making it a popular choice for performance-oriented street and competition applications.
Is the inlet flange divided or open?
The 178788 utilizes a T4 divided twin-scroll inlet designed to improve exhaust pulse energy and turbine efficiency when paired with a compatible divided manifold.
What outlet connection does this housing use?
This housing utilizes a Half Marmon 4.62-inch outlet commonly found on S400-series turbocharger applications.
How does the 178788 compare to the 178787 and 178789 housings?
The 178787 uses a smaller 0.90 A/R for quicker spool-up, while the 178789 uses a larger 1.10 A/R for greater top-end airflow. The 178788 offers a balanced middle-ground option between response and maximum flow.
