BorgWarner Turbine Housing EFR B1 63mm .80 T4 Twin Scroll WG Assy

What you get with this BorgWarner EFR B1 turbine housing is the housing itself, precisely cast to BorgWarner's exacting standards, along with the integrated twin-scroll wastegate assembly. This setup is designed for high-performance turbocharger applications where precise boost control and efficient exhaust gas flow are critical. The .80 A/R (area-to-radius ratio) is a key spec that dictates how quickly the turbo spools up and at what RPM range it will reach its peak efficiency. A larger A/R like this one generally means the turbo will make more power at higher RPMs, while a smaller A/R would prioritize quicker response down low.

The twin-scroll design is a notable feature here. It separates the exhaust pulses from two different cylinders (or pairs of cylinders) into two distinct paths within the turbine housing. This separation helps to prevent exhaust backpressure from interfering with the scavenging effect of the other cylinders, leading to improved turbocharger spool and a more efficient burn. This housing uses a T4 flange, a common and robust connection point for many performance turbochargers, and it comes complete with the wastegate assembly already installed. This means you're getting a well-built, integrated unit that simplifies installation and ensures the wastegate is properly matched to the housing's flow characteristics.

When considering a component like this, it's important to note that it is not CARB approved and cannot be shipped to California. This is a part intended for off-road or competition use where emissions regulations may differ. Proper tuning will be essential to get the most out of this housing and ensure your engine runs safely and efficiently with the increased airflow and boost potential it offers.