BorgWarner Turbine Housing EFR B2 70mm .92 T4 Twin Scroll WG Assy

This BorgWarner EFR B2 turbine housing features a 70mm inducer diameter and a .92 A/R ratio, designed for T4 flanged turbochargers with a twin-scroll wastegate setup. The twin-scroll design separates exhaust pulses from each cylinder bank, allowing for more efficient spool-up and improved throttle response, especially at lower RPMs. This housing is constructed from a durable cast iron material, chosen for its ability to withstand high exhaust temperatures and pressures commonly found in performance applications.

The .92 A/R (area-to-radius) ratio is a key specification that influences the turbocharger's performance characteristics. A higher A/R like .92 generally supports more top-end power by allowing exhaust gases to flow more freely, while still offering a reasonable compromise for spool compared to much larger A/R ratios. This makes it a versatile choice for builds aiming for a broad powerband. The T4 flange is a popular and robust mounting point for many aftermarket turbochargers, ensuring good compatibility with a wide range of turbocharger centers and exhaust manifolds.

This turbine housing is sold as an assembly, including the wastegate actuator. It is important to note that this part is not CARB approved and cannot be shipped to California due to emissions regulations. For optimal performance and longevity, ensure proper exhaust manifold fitment and wastegate control setup during installation.