What is the A/R ratio and why does it matter?

The A/R ratio (Area over Radius) of a turbine housing indicates its flow capacity. A 1.05 A/R, like on this housing, offers a good compromise, allowing the turbo to spool up relatively quickly while still supporting high boost levels for significant top-end power.

What does 'twin scroll' mean for performance?

A twin scroll housing separates the exhaust pulses from each cylinder bank into two distinct paths within the housing. This helps prevent exhaust backpressure from interfering with incoming exhaust gases, leading to improved turbine efficiency and a quicker turbocharger response, especially at lower engine speeds.

What is the material of this turbine housing?

This BorgWarner turbine housing is constructed from durable cast iron. This material is chosen for its ability to withstand the extreme heat and pressure generated by exhaust gases in high-performance turbocharging applications.

BorgWarner EFR B2 Turbine Housing 1.05 T4 12741019002

Name: BorgWarner Turbine Housing EFR B2 74mm 1.05 T4 Twin Scroll
Brand: BorgWarner
SKU: borgwarner-borgwarner-turbine-housing-efr-b2-74mm-1-05-t4-twin-scroll-t14-4385217
Price: 856.51 USD
Availability: InStock

BorgWarner Turbine Housing EFR B2 74mm 1.05 T4 Twin Scroll

$856.51

Only 3 left in stock

BorgWarner EFR B2 Turbine Housing EFR B2 74mm 1.05 T4 Twin Scroll

Key Features

Fits BorgWarner EFR B2 turbocharger center sections.
Features a 74mm turbine wheel.
Has a 1.05 A/R ratio for a balance of spool and top-end power.
Utilizes a T4 divided inlet flange for optimal exhaust flow.
Twin scroll design improves efficiency and response.
Constructed from durable cast iron for high-temperature resistance.

This turbine housing is designed to fit specific BorgWarner EFR turbocharger center sections. Please verify compatibility with your existing turbocharger or build specifications.

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Product Details

This is the BorgWarner EFR B2 twin scroll turbine housing, designed for high-performance turbocharger builds. It features a 74mm wheel size with a 1.05 A/R ratio and a T4 divided inlet flange, making it suitable for a wide range of powerful engine applications where precise boost control and quick spool are critical. The twin scroll design helps improve exhaust gas separation, leading to better turbine efficiency and faster response, especially at lower RPMs.

Crafted from durable cast iron, this housing is built to withstand the extreme temperatures and pressures found in performance turbo systems. The 1.05 A/R ratio is a popular choice for many applications, offering a good balance between rapid spool-up and the ability to sustain high boost levels for peak power. Its T4 divided inlet configuration is designed to work with specific turbocharger center sections, ensuring optimal exhaust flow and preventing interference between the scroll paths. This housing is a key component for anyone looking to build or upgrade a custom turbo setup for maximum performance.

Please note that this turbine housing is not CARB approved and cannot be shipped to California. It is intended for off-road use or in states where emissions regulations permit its installation. Ensure compatibility with your specific turbocharger center section and manifold before purchase.