Product Description
BorgWarner 179905 S300SX3 Exhaust Housing — 1.00 A/R, 74mm, T4
BORGWARNER 179905 is a genuine AirWerks S300SX3 turbine housing with a 1.00 A/R and 74mm turbine fitment on a T4 footprint. Dial in drive pressure and spool characteristics on S300 builds for street/strip or towing-focused setups.
Key Specifications
- Platform: BorgWarner AirWerks S300SX3
- A/R Ratio: 1.00
- Turbine Fitment: 74mm S300SX3 wheel
- Inlet Flange: T4 (verify manifold style and divided vs. open compatibility)
- Construction: Cast-iron housing, OEM-quality machining and finish
Confirm your existing turbine wheel size, outlet connection, and manifold/downpipe hardware before purchase. This listing is for the exhaust housing only (no center section or compressor parts included).
When to Choose 1.00 A/R
- Balanced response: Faster spool than larger A/R housings while maintaining strong mid–top-end flow on 5.9L–6.7L builds.
- Towing & street: Helps manage drive pressure and EGTs without giving up too much response.
- Compound-ready: Works well as the high-pressure housing in S300/S400 compound systems.
Shop Turbo Sections by Vehicle
Dodge/Ram Cummins
- CUMMINS MAIN HUB (Home tab)
- 1989–1993 5.9L (VE) — Turbocharger
- 1998.5–2002 5.9L (VP44) — Turbocharger
- 2003–2007 5.9L CR — Turbo/Supercharger
- 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 any S300?
No. It is designed for S300SX3 center sections using a 74mm turbine wheel. Always verify wheel size and mating surfaces before ordering.
Is the inlet divided or open?
This housing uses a T4 footprint. Check your manifold for divided vs. open and match accordingly; mixing can hurt spool and flow.
Do I need new gaskets and hardware?
We recommend fresh T4 gasket, manifold studs/nuts, and the correct downpipe connection to prevent leaks and ease service.
Will this change spool vs. my current setup?
Compared to larger A/R housings, 1.00 A/R generally spools quicker with stronger midrange. Final results depend on engine displacement, fueling, and turbine/compressor wheels.
Is it wastegated?
This listing is for the housing only and is non-wastegated. For external gating, plan a divided T4 manifold and gate placement in the hot pipe or manifold runner.
Why Buy BorgWarner from CPP Diesel
- Genuine AirWerks components and expert fitment support
- Fast shipping and secure packaging
- Support for single or compound S300/S400 builds
- Real-world guidance for Cummins, Powerstroke & Duramax platforms