Product Description
The BorgWarner 177103 S400 Exhaust Housing is a genuine AirWerks cast-iron turbine housing sized for the 83mm S400 wheel with a T4 twin-scroll (divided) inlet and a 1.00 A/R. It’s the sweet-spot housing when you want crisp spool, strong mid-range, and serious top-end flow in single or compound S400 builds.
Fitment & Use
- Turbo family: BorgWarner AirWerks S400 (S400SX3/SX-E/SX4) using the 83mm turbine wheel.
- Inlet: T4 twin-scroll (divided) • A/R: 1.00.
- Outlet: 5.75" Marmon (half-Marmon) style (typical S400).
- Great for 5.9/6.7 Cummins, Duramax, and Power Stroke S400 conversions where a T4 footprint is desired.
Why CPP Diesel
- Genuine BorgWarner components—no knockoffs.
- Free shipping in the U.S. lower 48 on this item.
- Fast fulfillment and tech-support from diesel enthusiasts.
Cross-Reference / Alternatives (BorgWarner on CPP only)
- BORGWARNER 177102 — 83mm, T4, 0.90 A/R (quicker spool).
- BORGWARNER 177104 — 83mm, T4, 1.10 A/R (more top-end).
- BORGWARNER 177105 — 83mm, T4, 1.25 A/R (max top-end).
- BORGWARNER 176811 — 83mm, T6, 1.10 A/R (T6 footprint option).
- BORGWARNER 14961019007 — 96mm, T6, 1.15 A/R (96mm wheel).
Important Notes
- This part is the turbine/exhaust housing only (no center/cartridge or compressor cover).
- Emissions/Use: Typical aftermarket turbine housings are not CARB-approved and may be restricted in CA/NY/ME; check local laws.
- Prop 65: This product can expose you to chemicals including silica, known to the State of California to cause cancer. See www.P65Warnings.ca.gov.
FAQ
What turbine wheel does 177103 fit?It’s designed for the 83mm S400 turbine wheel with a T4 divided inlet.
How does 1.00 A/R compare to 0.90 or 1.10?
0.90 spools quicker but has less top-end; 1.10/1.25 support more peak flow but spool slower. The 1.00 A/R is a balanced choice many street/strip builds prefer.
Is this a true twin-scroll housing?
Yes—BorgWarner catalogs list the 17710x T4 housings as volute, twin-flow (divided).
Do I need a specific outlet clamp?
Most S400 housings use a 5.75" (half-Marmon) style outlet—verify your downpipe/clamp style before ordering.
Does CPP include shipping?
Yes—this item ships free in the lower 48 from CPP Diesel.
Specifications for BORG WARNER 177103
| Turbo Series | AirWerks S400 (S400SX3/SX-E/SX4) |
| A/R & Inlet | 1.00 A/R • T4 twin-scroll (divided) |
| Turbine Wheel Fitment | 83mm S400 turbine |
| Outlet | Approx. 5.75" Marmon (half-Marmon) |
| UPC | 840232706697 |
| GTIN | 0840232706697 |
| Cross Reference | 177102 (0.90 A/R T4), 177104 (1.10 A/R T4), 177105 (1.25 A/R T4) |
| E-codes / Emissions | Not CARB approved; competition/off-road where permitted |
| Shipping Info | Ships free to lower 48 (standard ground).* |
| Prop 65 | This product can expose you to chemicals including silica (Prop 65). |
*Policy per product page at time of writing; subject to change.
