Product Description
BorgWarner 179641 S400 Exhaust Housing — 87mm, 1.25 A/R, T6
BORGWARNER 179641 is the heavy-duty T6 twin-scroll exhaust housing built for serious builds. Featuring an 87mm turbine wheel (≈ 80mm exducer) and a 1.25 A/R to balance spool and flow, this housing is designed to fit S400 turbos using T6 inlets.
Key Specifications
- Turbine Wheel Compatibility: 87mm × 80mm turbine wheel
- A/R Ratio: 1.25 (exhaust housing)
- Inlet Type: T6 twin-scroll
- Fitment: Designed for S400 bearing housings (journal bearing or S400 center sections)
Requires matched turbine wheel, correct mounting flanges, and proper exhaust plumbing. Not compatible with T4 inlets unless adapter/manifold modifications are made.
What’s Included
- BorgWarner 179641 S400 Exhaust Housing (87mm, 1.25 A/R, T6)
Recommended Add-Ons & Accessories
- CPP S400 Turbochargers (03-07 5.9L Cummins section)
- Duramax S400 Turbochargers & Housings
- Powerstroke S400 Turbo Systems
- CPP S400 4.0" Compressor Discharge Elbow
Fitment & Use Cases
Street / Light Race Builds: Best with moderate exhaust backpressure; expect later spool but very strong mid-to-upper power.
High-Power / Drag / Compound Builds: Excellent choice for big single or in compounds, especially where turbine flow capacity is a limiting factor.
Shop Turbo Sections by Vehicle
Dodge/Ram Cummins
- CUMMINS MAIN HUB (Home tab)
- 1998.5–2002 5.9L (VP44) — Turbocharger
- 2003–2007 5.9L CR — Turbocharger / Exhaust Housing Options
- 2007.5–2012 6.7L — Turbocharger
- 2013–2018 6.7L — Turbocharger
- 2019–2024 6.7L — Turbos & Accessories
Ford Powerstroke
GM Duramax
FAQ
Will this housing fit my current S400 turbo?
If your S400 uses a T6 twin-scroll inlet and an 87×80mm turbine wheel, yes. It replaces the exhaust housing only—bear in mind manifold flange, downpipe, oil feed/drain lines, and exhaust clearance must match.
How does 1.25 A/R affect spool vs top-end?
1.25 A/R gives more turbine exhaust flow and better upper-end than smaller A/Rs, but will spool a bit slower. Good balance for larger displacement or boosted fuel systems.
Is the T6 inlet significantly different than T4?
Yes. T6 is a much larger inlet size; adapting from T4 usually requires a new manifold or adapter. T6 allows greater flow and is preferred for high-output setups.
Can I use this in a compound turbo setup?
Yes—it works well as a low-pressure atmospheric housing in compounds where you want the turbine to flow hard, especially for big single or compound systems.
Do I need a new gasket or hardware?
Always. Exhaust housings that see extreme heat will warp surfaces; use proper gaskets, studs/bolts rated for high temp, and ensure hardware is torqued correctly.
Why Buy BorgWarner Turbos & Housings from CPP Diesel
- Real fitment guidance for Cummins, Powerstroke & Duramax platforms
- Fast shipping & rugged packaging
- From OEM replacement to fully custom performance configurations
- Phone & chat support from diesel pros
