BorgWarner 12801019001 EFR B2 80mm Turbine Housing 1.05 A/R T4 Twin Scroll

The BorgWarner 12801019001 is a high-performance turbine housing designed specifically for the EFR B2 series turbochargers. This precision-engineered housing features an 80mm turbine wheel accommodation with a 1.05 A/R (area/radius) ratio, optimized for applications requiring excellent top-end power and flow characteristics.

Key Features:

• 1.05 A/R ratio turbine housing for high-flow applications
• T4 twin scroll flange configuration for improved exhaust pulse separation
• 80mm turbine wheel compatibility (EFR B2 frame)
• Investment cast stainless steel construction for durability and heat resistance
• Divided twin scroll design reduces turbo lag and improves response
• Direct replacement housing for EFR turbocharger upgrades or rebuilds

The twin scroll design divides exhaust pulses from paired cylinders, maintaining velocity and reducing interference between exhaust events. The 1.05 A/R ratio makes this housing ideal for higher horsepower applications where maximum flow is prioritized, typically suited for engines producing 500+ horsepower. The T4 flange pattern provides a robust mounting interface common in high-performance and racing applications.

This turbine housing is compatible with BorgWarner EFR (Engineered For Racing) turbochargers using the B2 frame size and can be used for custom turbo builds, upgrades, or replacement of damaged housings.