BorgWarner | AirWerks S400 Turbine Housing 1.25a/r

AirWerks S400 Turbine Housing — T4 Twin Scroll A/R 1.25

Upgrade or complete your BorgWarner AirWerks S400 turbocharger build with the 177105 turbine housing. Cast from durable iron and engineered to OEM tolerances, this housing pairs with BorgWarner S400 series 83/74mm turbine wheels to deliver consistent spool-up, optimized exhaust flow, and reliable boost response on performance gasoline and diesel applications.

With an A/R of 1.25 and a twin scroll configuration, this housing is sized to balance low-end response with top-end flow — ideal for street, strip, and dedicated motorsport builds where exhaust energy management matters.

Key Benefits

• Genuine BorgWarner AirWerks S400 turbine housing
• A/R 1.25 for tuned spool and flow characteristics
• Twin Scroll design for improved exhaust pulse separation and faster spool
• T4 turbine inlet flange
• Cast iron construction for thermal durability
• Direct fit to compatible BorgWarner S400 core assemblies and supercores

Specifications

Compatible Turbochargers (sold separately)

• P/N 177101 (S400SX 75mm T4)
• P/N 177248 (S400SX 71mm T4)

Important Notes

• Turbine housings are sold separately from the turbocharger and core assembly.
• External wastegate may be required depending on your build — verify housing porting and your boost control strategy.
• Need a repair? View BorgWarner core assemblies — factory-balanced new cartridges that pair with your existing end-housings for a quick rebuild.
• Not sure which size turbo or housing you need? Visit BorgWarner's Match Bot to pick the right combination for your application and goals.

Note:

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