Product Description
BorgWarner 177103 S400 Exhaust Housing — 83mm, T4 1.00 A/R
BORGWARNER 177103 is a performance exhaust housing for S400-series turbos featuring an 83mm turbine wheel, divided twin-scroll volute, and a standard T4 inlet flange. Built for serious applications where exhaust flow, durability, and spool response matter.
Key Specifications
- Turbine Wheel Size: 83mm OD
- A/R Ratio: 1.00; volute is divided twin-scroll for better exhaust scavenging
- Inlet Flange: T4 twin-scroll inlet
- Outlet: Half Marmon, approx 4.62″ (4 5/8″)
- Material: Cast iron, designed to handle high exhaust gas temp and pressure
What’s Included
- BorgWarner 177103 S400 exhaust housing, 83mm turbine, T4 1.00 A/R
Recommended Add-Ons
- CPP - Wastegate Flange Kit for T4 housings
- CPP Welded Divided Twin-Scroll Exhaust Manifold
- CPP Half-Marmon 4.62″ Outlet Kit
Fitment & Build Advice
This housing is built to mate with **S400 turbine shafts / cartridges**. Ensure your compressor side, manifolds, external wastegate (if used), and exhaust piping match T4 inlet and Marmon outlet specs.
Works great in high-flow single turbo builds or the low-pressure stage in S300/S400 compound setups. Spool will be somewhat slower than smaller turbine housings, but once spooled this housing delivers excellent top-end flow and power.
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Dodge/Ram Cummins
- CUMMINS MAIN HUB (Home tab)
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FAQ
Can I use this housing with an S300 turbine?
No – this housing is made for S400 turbine shaft / wheel sizes. Using an S300 turbine wheel will mismatch flow and likely reduce performance or damage components.
Will this fit my stock exhaust manifold?
No, unless your manifold is already T4 inlet standard. Most stock manifolds are different inlet style; expect to need a custom manifold or adapter.
Does the 1.00 A/R ratio affect spool speed?
Yes. A 1.00 A/R delivers better top-end flow but will spool slower than smaller A/R housings; match turbo sizing and fuel system to avoid lag or low-RPM bog.
Does this housing support an external wastegate?
Yes. It features a divided twin-scroll volute, designed to work well with external wastegate setups for boosting control and flow.
Is this legal for street use?
Depends on your state. Many versions are not emissions certified; check local laws. It’s race / off-road friendly; street legality may be restricted.
Why Buy BorgWarner Turbos & Components from CPP Diesel
- Detailed power & fitment guidance for Cummins, Powerstroke & Duramax platforms
- High-quality BorgWarner parts (genuine, cast-iron, twin-scroll, etc.)
- Fast shipping, proper packaging, and support for turbo builds
- From replacement pieces to race-ready upgrades & compounds
