What does the 1.25 A/R ratio mean for my turbo?

The 1.25 A/R ratio refers to the size of the turbine housing's volute. A larger A/R like 1.25 generally helps improve exhaust gas flow at higher RPMs, potentially allowing for more top-end horsepower and a broader powerband compared to smaller A/R housings.

What type of flange does this housing use?

This turbine housing uses a T4 exhaust housing flange. This is a common flange size and type used in many aftermarket and performance turbocharger applications, ensuring compatibility with T4-style exhaust manifolds and downpipes.

Can this housing be shipped to California?

No, this part is not CARB approved and cannot be shipped to California due to emissions regulations.

BorgWarner S400SX Turbine Housing 1.25 A/R T4 178790

Name: BorgWarner Turbine Housing S400SX SX 1.25 A/R-T4 VTF (87mm)
Brand: BorgWarner
SKU: borgwarner-borgwarner-turbine-housing-s400sx-sx-1-25-a-r-t4-vtf-87mm-t14-4385341
Price: 320.00 USD
Availability: InStock

BorgWarner Turbine Housing S400SX SX 1.25 A/R-T4 VTF (87mm)

$320.00

In Stock

BorgWarner S400SX Turbine Housing 1.25 A/R T4 (87mm). Direct replacement for improved exhaust flow.

Key Features

Fits BorgWarner S400SX turbochargers.
Features a 1.25 A/R (Area/Radius) ratio for managing exhaust flow.
Utilizes a T4 exhaust housing flange for broad compatibility.
Includes an 87mm inducer diameter.
Well-built by BorgWarner for reliable performance.

This turbine housing is designed for specific BorgWarner S400SX turbocharger models. Please verify your existing turbocharger's part number to confirm compatibility.

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Product Details

This is a BorgWarner S400SX turbine housing, specifically the 1.25 A/R T4 model with an 87mm inducer. It's designed to replace the stock housing on compatible S400SX turbochargers, helping to manage exhaust gas flow and influence the turbo's spool characteristics and top-end power. If you're looking to fine-tune your turbo setup or replace a damaged housing, this part offers a well-built option from a trusted name in forced induction.

The 1.25 A/R (Area/Radius) ratio is a key spec here, indicating a larger housing volume. This generally means it can help the turbocharger breathe better at higher engine loads and RPMs, potentially allowing for more top-end horsepower. The T4 flange ensures compatibility with T4-style exhaust manifolds and downpipes, which are common in many performance applications. BorgWarner is known for making solid components, and this turbine housing is built to handle the heat and pressure of boosted engines.

When installing a new turbine housing, it's important to ensure all connections are properly sealed to prevent exhaust leaks. This housing is designed as a direct replacement for specific S400SX turbocharger models, so verify your existing turbocharger's part number to confirm compatibility. Note that this part is not CARB approved and cannot be shipped to California.