Turbine Housing (S200, .83, T4)

BorgWarner 177191 is a genuine OEM turbine housing (exhaust side) from the AirWerks S200SX / S200SX-E series, designed for high-performance diesel and gas applications in drag racing, truck pulling, street performance, and custom turbo builds. This housing is a popular choice for pairing with S200SX or S200SX-E super cores (e.g., billet wheel versions) to create responsive, high-flow turbos in the 220-580 hp range (or higher with supporting mods). Key Features & Specifications Model/Series: BorgWarner S200SX/SX-E Turbine Housing (part of the AirWerks lineup). A/R Ratio: 0.83 (tight for quick spool and strong low-to-mid range torque; other options in the family include 1.00, 1.09, 1.15, 1.22, 1.27 A/R). Inlet Configuration: T4 divided (twin scroll / twin volute / twin flow) bolt pattern with T3 volute opening (allows for twin-scroll exhaust manifold compatibility to reduce pulse interference and improve spool). Outlet: V-band (typically 3/4" Marmon or similar for easy clamping and sealing). Turbine Wheel Compatibility: Designed for 70mm turbine wheel (often paired with 61mm exducer in S200 setups; matches common S200SX wheels like 69-70mm OD / 61mm exducer). Material: Cast iron for durability under high exhaust gas temperatures (EGTs) in diesel pulling/towing or high-boost gas applications. Power Range: Supports turbos rated 220-580 hp in standard S200SX configs (e.g., with 55-76mm compressor wheels); can push higher (600+ hp) in aggressive builds with billet upgrades, proper fueling, and tuning. Other Notes: Twin hydrodynamic journal bearings in compatible cores; adjustable compressor/turbine housing clocking for fitment flexibility; no integrated wastegate (external WG setups common in performance apps). Applications Universal fit for custom single-turbo setups on diesel engines (e.g., Cummins 5.9L/6.7L, Duramax, Powerstroke swaps) or gas engines. Ideal for S200SX complete turbos or S200SX-E super cores (billet FMW compressor, race cover, upgraded bearings). Popular in street/strip trucks, drag Cummins builds, or pulling rigs where quick spool and mid-range power are prioritized over max top-end flow. Often used with twin-scroll manifolds for better exhaust pulse separation and reduced drive pressure.