BorgWarner Turbine Housing SX S400 T4 A/R 1.00 83/74mm Twin Scroll

This BorgWarner SX turbine housing features a 1.00 A/R ratio and a twin scroll design, specifically built for the S400 series turbochargers. The A/R ratio controls the velocity of exhaust gases entering the turbine wheel, and a 1.00 A/R typically suits larger displacement engines or those looking for improved top-end power delivery. The twin scroll design separates exhaust pulses from each cylinder bank, allowing them to enter the turbine housing more efficiently. This separation helps reduce exhaust backpressure and can improve turbo spool-up speed, especially in V-engine configurations.

Constructed from durable cast iron, this housing is built to withstand the high temperatures and pressures associated with boosted engine operation. The T4 flange offers a common mounting point for many aftermarket turbocharger setups, and the 83mm turbine wheel diameter paired with a 74mm exducer measurement is a popular choice for performance builds seeking a balance between responsiveness and high-flow capability. This housing is designed to bolt directly onto compatible S400 SX turbocharger center sections, making it a straightforward component for turbo upgrades or replacements.

When installing this turbine housing, ensure you use a high-quality gasket between the housing and the turbocharger's center section to prevent exhaust leaks. Proper exhaust manifold and downpipe connections are also crucial for optimal performance and sealing. This part is not CARB approved and cannot be shipped to California.