BorgWarner Turbine Housing EFR B2 70mm 1.05 T4 Twin Scroll

BorgWarner is well-known for its advanced turbocharger technology, and this EFR B2 turbine housing is a prime example of their expertise in forced induction. This specific housing is designed for high-performance applications, featuring a 70mm inducer diameter and a 1.05 A/R (area-to-radius) ratio. The T4 twin-scroll inlet flange is a key feature, allowing for improved exhaust gas pulsing and faster turbo spool-up compared to single-scroll designs. This setup helps your engine breathe more efficiently, especially at lower RPMs, leading to a more responsive feel.

Constructed from durable cast iron, this housing is built to withstand the high temperatures and pressures associated with demanding engine builds. The 70mm wheel size is a good balance for many performance applications, offering a significant airflow increase over stock while maintaining reasonable response. The 1.05 A/R ratio is on the larger side, which generally favors top-end power and high-RPM efficiency, making it suitable for engines that spend a lot of time in their power band. The twin-scroll design is crucial here; it separates exhaust pulses from each cylinder bank, preventing interference and ensuring each pulse arrives at the turbine wheel at the optimal moment for maximum energy transfer.

When considering this turbine housing, remember it's intended for custom turbocharger setups or as a replacement part for specific BorgWarner EFR turbochargers. You'll need to ensure compatibility with your existing or planned turbocharger's compressor cover and internal components. Because this part is not CARB approved, it cannot be shipped to California. Always consult with your turbo specialist or engine builder to confirm this housing is the right match for your specific performance goals and vehicle setup.