BorgWarner - S300SX3 S366 Turbocharger (0.88 A/R) – 177281

Upgrade your build with the BORGWARNER 177281 S300SX3 (S366/74) featuring a .88 A/R open (undivided) T4 turbine housing and proven AirWerks journal-bearing durability. Built within the AirWerks S300SX3 family, this turbo uses an extended-tip forged milled compressor wheel and a ported shroud (anti-surge) cover to support strong airflow and reliable boost response.

The 177281 is a popular choice for responsive street/strip single turbo setups and is frequently used as the high-pressure unit in S300/S400 compound configurations. Always verify manifold, downpipe, oil feed/return, and charge piping compatibility for your specific platform before ordering.

Included

• Complete BORGWARNER 177281 S300SX3 (S366/74) turbocharger assembly
• .88 A/R open (undivided) T4 turbine housing
• Ported shroud (anti-surge) compressor cover
• Journal-bearing center housing rotating assembly (CHRA)

Key Features

• Turbo Series: AirWerks S300SX3 (S366/74)
• Compressor: ≈66.1mm inducer / ≈91.4mm exducer with ported shroud cover
• Turbine: ≈80mm inducer / ≈73mm exducer
• Housing: .88 A/R Open T4 inlet
• Center Section: Twin hydrodynamic journal bearings
  

Fitment

Universal T4 mount (not vehicle-specific).

Commonly used on 5.9L / 6.7L Cummins with T4 manifold adapters, as well as custom Power Stroke and Duramax builds. Designed for open (non-divided) T4 manifolds.

Confirm:
T4 flange type (open vs. divided)
Turbine outlet/downpipe compatibility
Oil feed and return routing
Charge piping size and intercooler connections

Professional installation recommended.

Prop 65 Warning

Using and/or handling this product may expose you to chemicals known to the State of California to cause cancer or reproductive harm. For more information, visit P65Warnings.ca.gov.