What is CSF's B-Tube Technology?

CSF's B-Tube Technology uses a specially formed tube with a seam brazed seam, increasing the heat transfer surface area by approximately 15% over standard oval tubes. This design allows for dual liquid laminar flow, improving cooling efficiency.

Does this radiator come with everything needed for installation?

This radiator is designed as a direct fit and accepts all attaching OEM components, including your original hoses, AC condenser, mounting brackets, and fan shroud. You will receive the radiator itself, OE-style brackets, and a drain plug.

What is the benefit of the built-in oil cooler?

The integrated oil cooler helps to manage engine oil temperatures, which is especially beneficial for high-performance applications or track use. Keeping oil within its optimal temperature range can help protect engine components and maintain consistent performance.

CSF 2-Row Radiator w/ Oil Cooler 7042O - 2008-2021 Subaru WR

Name: CSF 08-15 Subaru WRX/STI 2-Row Radiator w/Built-In Oil Cooler
Brand: CSF
Price: 695.00 USD
Availability: InStock

CSF 08-15 Subaru WRX/STI 2-Row Radiator w/Built-In Oil Cooler

$695.00

In Stock

CSF 08-15 Subaru WRX/STI 2-Row Radiator w/ Built-In Oil Cooler. This all-aluminum radiator offers improved cooling for street or track.

Key Features

Fits 2008-2021 Subaru WRX/STI, 2005-2009 Legacy/Outback, 2009-2013 Forester, 2008-2016 Impreza, and 2016-2017 Crosstrek.
All-aluminum construction with a 2-row, 42mm core featuring CSF's exclusive B-Tube Technology for improved heat transfer.
Includes a built-in oil cooler for enhanced engine temperature management.
Features ultra-efficient, multi-louvered fins precisely aligned to maximize airflow and heat dissipation.
True 'drop-in fit' design requires no modifications and accepts all attaching OEM components, including quick-connect hoses, AC condenser, and fan shroud.
CNC machined brackets and fittings ensure superb fit and durability.

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Will this fit your vehicle?

Product Details

This CSF radiator is a direct-fit, all-aluminum replacement designed for a range of Subaru models including the 2008-2021 WRX and STI, as well as the 2005-2009 Legacy and Outback. It features a built-in oil cooler, making it a solid choice for high-horsepower builds or track use where consistent engine temperatures are critical. You'll receive the radiator itself, complete with OE-style brackets and a race-style drain plug, ready to install using your existing hoses and fan shroud.

What sets this radiator apart is its advanced core design. It uses CSF's exclusive B-Tube Technology, which creates a dual liquid laminar flow and increases heat transfer surface area by about 15% compared to standard oval tubes. This means more efficient cooling within the same space. The core also features ultra-efficient, multi-louvered fins that are precisely aligned to maximize airflow and heat rejection, a design tested in CSF's wind-tunnel lab. The brackets and fittings are CNC machined for a precise fit and durability, and the inlet and outlet connections are designed to match the factory setup, so you can reuse your OEM hoses.

CSF has been making radiators for over 50 years, and this unit is built to perform. It's a true drop-in fit, meaning no modifications are needed for installation. The all-aluminum construction is lighter than stock and offers excellent heat dissipation. For those pushing their Subaru's performance, especially in demanding conditions, this radiator is a well-built component that helps maintain optimal engine temperatures.