Does this radiator include a built-in oil cooler?

Yes, this CSF radiator features a built-in oil cooler along with a filler neck. This integrated design helps manage oil temperatures in addition to engine coolant.

What makes CSF's B-Tube technology different from standard radiator tubes?

CSF's B-tubes are specially shaped and brazed to increase the heat transfer surface area by approximately 15% compared to regular oval tubes. This design allows for dual liquid laminar flow, enhancing cooling efficiency.

Will I need to modify my car to install this radiator?

No, this CSF radiator is designed as a true 'drop-in fit' for the 2002-2007 Subaru Impreza WRX/STI. It accepts all original equipment components, including hoses and mounting brackets, so no modifications are necessary.

2002-2007 Subaru Impreza Radiator | CSF 3076O

Name: CSF 02-07 Subaru WRX/STI Radiator w/Built-In Oil Cooler/Filler Neck
Brand: CSF
SKU: csf-csf-02-07-subaru-wrx-sti-radiator-w-built-in-oil-cooler-filler-neck-t14-205223
Price: 665.00 USD
Availability: BackOrder

CSF 02-07 Subaru WRX/STI Radiator w/Built-In Oil Cooler/Filler Neck

$665.00

On Backorder — Expected to ship by Jun 21, 2026

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Fits 2002-2007 Subaru Impreza. CSF all-aluminum radiator with built-in oil cooler and filler neck for improved engine cooling.

Key Features

Fits 2002-2007 Subaru Impreza WRX and STI.
All-aluminum construction with a 2-row, 42mm core.
Features CSF's exclusive B-Tube technology for increased heat transfer surface area.
Includes a built-in oil cooler and filler neck.
True 'drop-in fit' design requires no modifications for installation.
CNC machined brackets and fittings ensure a durable and precise fit.

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Will it fit your car?

Fits these vehicles

Subaru Impreza 2002-2007

Product Details

If you're pushing your 2002-2007 Subaru Impreza WRX or STI hard, whether on the street or the track, keeping your engine cool is critical. This all-aluminum radiator from CSF is built to handle the extra heat generated by high-horsepower builds and demanding motorsports use. It's a direct replacement, meaning it fits right in without needing any modifications to your car's existing setup.

CSF uses a unique 2-row, 42mm core with their B-Tube technology. Unlike standard oval tubes, these B-tubes are shaped and brazed to increase the heat transfer surface area by about 15%. This design is stronger and allows for a dual liquid flow, which helps dissipate heat more efficiently. The radiator also features multi-louvered fins that are precisely aligned to maximize airflow, and CSF tests these designs in their wind tunnel to ensure top performance. The brackets and fittings are CNC machined for a solid fit and durability, and the inlet and outlet connections are designed to use your factory hoses.

This CSF radiator also includes a built-in oil cooler and a filler neck, making it a comprehensive cooling solution for your WRX/STI. It comes with an all-aluminum race-style drain plug for easy draining and has a polished finish. CSF has been making radiators for over 50 years, so you can trust their expertise in keeping your engine running at its best.