CSF Subaru WRX/STI 2002-2007 High-Performance Radiator w/ built-in Oil Cooler

For owners wanting to consolidate engine and oil cooling into a single upgrade, CSF's High-Performance Radiator with Built-In Oil Cooler brings both together in one unit, built on the same proven all-aluminium radiator platform trusted across CSF's wider WRX/STI range. Rather than sourcing a separate radiator and oil cooler as two components, this genuinely integrated design simplifies both the parts list and the install.

The core uses CSF's exclusive B-Tube technology, a specially engineered "B"-shaped tube carefully formed and brazed over the seam, increasing heat transfer surface area by approximately 15% over regular tubes for genuine dual liquid laminar flow, while allowing for thinner, lighter aluminium construction that's actually stronger than a normal welded design. High-efficiency, multi-louvered fins are precisely aligned and wind-tunnel tested for maximum heat rejection. The built-in oil cooler comes complete with a GReddy thermostatic sandwich plate, which regulates oil flow to the cooler based on temperature rather than running the oil through the cooler constantly, and two -10 forged right-angle fittings are included for a clean, properly routed installation.

Works with: OEM mounting points and hose connections. Includes filler neck.

Why Choose This Radiator with Built-In Oil Cooler

• Genuinely integrated design, combines radiator and oil cooler into a single unit
• Includes a GReddy thermostatic sandwich plate for temperature-regulated oil flow
• Two -10 forged right-angle fittings included for clean, direct routing
• CSF's exclusive B-Tube core technology, approximately 15% more heat transfer than regular tubes
• All-aluminium, TIG-welded construction for genuine long-term durability
• Simplifies your parts list and install versus sourcing separate radiator and oil cooler components

Compatibility

• Subaru Impreza WRX/STI (2002-2007, with filler neck)

Fitment note: as with CSF's standard #3076 radiator for this platform, some real-world installs on early Bugeye-generation cars have reported minor trimming needed. Worth flagging to customers before installation.

What's Included

• All-aluminium radiator with integrated oil cooler core
• GReddy thermostatic sandwich plate
• Two -10 forged right-angle fittings