What is the benefit of a twin-scroll turbine housing?

A twin-scroll housing separates exhaust pulses from different cylinder banks. This separation helps the turbocharger spool up faster and reduces exhaust backpressure, leading to improved engine response and a broader powerband.

What does the 1.05 A/R ratio mean for performance?

The 1.05 A/R (Area/Radius) ratio indicates the size of the turbine housing's internal passage. A 1.05 ratio generally offers a good balance, providing strong top-end power capability while still allowing for reasonable low-end turbo response in many performance applications.

What material is this turbine housing made from?

This BorgWarner turbine housing is constructed from durable cast iron. This material is chosen for its ability to withstand the high temperatures and pressures generated by exhaust gases in performance engine setups.

BorgWarner EFR B2 Turbine Housing 1.05 T4 12801019001

Name: BorgWarner Turbine Housing EFR B2 80mm 1.05 T4 Twin Scroll
Brand: BorgWarner
SKU: borgwarner-borgwarner-turbine-housing-efr-b2-80mm-1-05-t4-twin-scroll-t14-4385221
Price: 842.56 USD
Availability: InStock

BorgWarner Turbine Housing EFR B2 80mm 1.05 T4 Twin Scroll

$842.56

Only 1 left in stock

BorgWarner EFR B2 Turbine Housing 80mm 1.05 T4 Twin Scroll

Key Features

This product is a BorgWarner EFR B2 turbine housing.
It features an 80mm inducer diameter.
The A/R ratio is 1.05.
It utilizes a T4 twin-scroll inlet flange.
The housing is constructed from durable cast iron.
The twin-scroll design helps improve turbocharger spool and reduce backpressure.

This is a universal turbocharger component and requires a compatible manifold and turbocharger assembly. Check manufacturer specifications for full compatibility details.

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Product Details

What you get with this BorgWarner EFR B2 turbine housing is a well-built component designed for high-performance forced induction setups. This specific housing features an 80mm inducer diameter and a 1.05 A/R (Area/Radius) ratio, paired with a T4 twin-scroll inlet flange. The twin-scroll design is key here; it separates the exhaust pulses from different cylinder banks, allowing them to spool the turbocharger more efficiently and reduce exhaust backpressure. This means you can expect a quicker response from your turbo, especially at lower RPMs, and a broader powerband.

Crafted from durable cast iron, this housing is built to withstand the extreme temperatures and pressures found in demanding engine applications. The 1.05 A/R ratio is a good balance for many performance builds, offering a strong top-end power capability without sacrificing too much low-end response. BorgWarner's EFR (Engineered for Racing) line is known for its robust construction and performance-oriented design, and this turbine housing is no exception. It’s a critical piece for anyone looking to build or upgrade a turbo system where efficiency and power delivery are paramount.

When installing this turbine housing, ensure you have the correct T4 twin-scroll manifold to match the flange. Proper sealing and secure mounting are essential to prevent exhaust leaks, which can significantly impact performance and turbo longevity. While this housing is not CARB approved and cannot be shipped to California, it represents a solid choice for performance builds in other regions where emissions regulations allow.