Product Description
BorgWarner 179641 S400 Exhaust Housing — 87mm, 1.25 A/R, T6
Build your S400 the right way with the genuine BorgWarner 179641 T6 divided (twin-scroll) exhaust housing. Sized at 1.25 A/R and designed for the 87×80mm S400 turbine wheel, it delivers serious top-end flow for big-single S400s or as the low-pressure atmospheric charger in compound setups—all with BorgWarner’s proven casting quality.
Highlights
- T6 twin-scroll inlet for pulse separation and flow
- 1.25 A/R for strong mid-to-upper RPM performance
- Fits S400 bearing/center sections with 87mm × ~80mm turbine wheel
- Ideal for big singles and S300/S400 compound systems
Fitment & Notes
- Turbo Family: BorgWarner S400 / S400SX / SX-E (87mm turbine)
- Inlet: T6 divided (twin-scroll)
- Outlet: Standard S400 turbine discharge (Marmon style)
- Requires: Matching 87mm turbine wheel, correct T6 manifold, downpipe, gaskets, and high-temp hardware
- Good to know: Compared with smaller A/R housings, 1.25 A/R spools later but carries more top-end power
Cross-Reference / Related BorgWarner Items (CPP Diesel)
- BORGWARNER 14961019007 — S400, 96mm, 1.15 A/R, T6
- BORGWARNER 171698 — S400SX4, 96mm, 1.32 A/R, T6
- BORGWARNER 176811 — S400, 83mm, 1.10 A/R, T6
FAQ
Will this housing fit my current S400 turbo?If your S400 uses a T6 twin-scroll inlet and an 87×80mm turbine wheel, this housing is the correct style. Verify your manifold, downpipe, and hardware.
How does 1.25 A/R affect spool vs. top-end power?
It spools later than smaller A/R housings but maintains stronger high-RPM flow and power—great for high-horsepower builds and compounds.
Is the T6 divided inlet different than T4?
Yes. T6 is larger and generally requires a T6 manifold/adapter. It enables higher flow and is preferred for big-power singles or atmospheric chargers.
Do I need new gaskets/hardware?
We recommend new gaskets and high-temp studs/bolts due to heat-cycle fatigue on exhaust joints.
Specifications for BORG WARNER 179641
| Attribute | Value |
|---|---|
| Turbo Series | S400 / S400SX |
| A/R | 1.25 (exhaust housing) |
| Inlet / Volute | T6 divided (twin-scroll) |
| Turbine Wheel Compatibility | 87mm × ~80mm (S400) |
| UPC | 840232710496 |
| GTIN | 00840232710496 |
| Cross Reference | BW 14961019007 (96mm 1.15 A/R T6) • BW 171698 (96mm 1.32 A/R T6) • BW 176811 (83mm 1.10 A/R T6) |
| E-codes | Not specified |
| Shipping Info | Free Shipping; box dims ~11" × 11" × 11" (from CPP listing) |
| Prop 65 | This product can expose you to chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. See www.P65Warnings.ca.gov. |
Why Buy from CPP Diesel
- Genuine BorgWarner parts with expert fitment support
- Fast shipping and careful packaging
- Real diesel techs ready to help spec singles or compounds
