Product Description
Make serious, reliable power with the genuine BORGWARNER 179174 S400SX (S475/87) in a divided T4 1.10 A/R housing. Built on the proven AirWerks S400 platform with twin hydrodynamic journal bearings and extended-tip compressor aero, this unit shines as a big single or as the atmospheric charger in S300/S400 compounds.
Why enthusiasts choose this S475
- S475 compressor — 74.56–75mm inducer (≈3.94" OD), ported-shroud cover for surge resistance
- 87mm turbine — matched to a 1.10 A/R, twin-scroll T4 housing for strong flow and drive-pressure control
- AirWerks center section — durable journal bearings; adjustable housing orientation
Fitment & Use Cases
Platforms: Popular on high-output Cummins, Power Stroke, and Duramax builds as a performance upgrade or as the low-pressure (atmospheric) turbo in compound setups. Verify manifold flange (divided T4), downpipe connection, charge piping, and oil feed/return for your specific application.
Cross-Reference / Alternatives (BorgWarner on CPP Diesel)
- BorgWarner 177248 S400SX3 — S471/83, 1.10 A/R, T4
- BorgWarner 171701 S400SX4 — S471/96, 1.32 A/R, T6
- BorgWarner 171702 S400SX4 — S475/96, 1.32 A/R, T6
- BorgWarner 169012 S400SX — S464/83, 1.10 A/R, T6
- BorgWarner 178789 S400SX Turbine Housing — 1.10 A/R, T4
With sufficient fuel, intercooling, and tuning, S475/87/1.10 T4 builds can support strong street/strip power as a single. In compounds, it excels as the atmospheric unit feeding a responsive S300 high-pressure turbo.
Do I need a divided T4 manifold?
Yes. This turbo uses a twin-scroll (divided) T4 inlet. Confirm manifold, downpipe, charge piping, and oil lines before purchase.
Which turbine housing part number is standard?
The 179174 is commonly built with BorgWarner turbine housing 178789 (1.10 A/R, T4). Always verify on your unit’s tag.
Any other supporting mods required?
Plan for adequate fueling, high-flow intercooler, strong charge plumbing, and attention to drive pressure/EGTs. For compounds, use proper wastegate/boost control and target reasonable pressure ratios.
Specifications for BORG WARNER 179174
| Turbo Series | AirWerks S400SX (S475/87) |
| Compressor | 3.94" (100.17 mm) OD, 2.94" (74.56 mm) inducer; extended-tip design |
| Turbine | 87.37 mm wheel OD, 81.74 mm exducer; 1.10 A/R divided T4 housing |
| Standard Housing (Factory) | 178789 — S400SX T4 1.10 A/R (divided) |
| Center Section | Twin hydrodynamic journal bearings; adjustable housing orientation |
| GTIN | 840232701227 |
| UPC | 0840232701227 |
| E-Codes | Not applicable (universal performance) |
| Cross Reference | Super-core / service items commonly associated with this frame: 14009097001 (super-core), 318396 (service kit), 14007110000 (360° thrust kit). Verify per unit tag. |
| Shipping Info | Ships from CPP Diesel; free ground shipping on most orders. Box dimensions/weight shown at checkout. |
| Prop 65 | Warning may apply (nickel and other metals). See California guidance. |
Note: Always match the BorgWarner part number 179174 and your specific manifold/downpipe/oil line hardware before ordering.
