CSF Subaru Impreza WRX STI 2002-2007 High-Performance Radiator

CSF has over 5 decades of experience manufacturing radiators, so when it comes to keeping your engine cool and your WRX/STI running at its best, a CSF High-Performance All-Aluminum Radiator is the obvious choice. Designed to perform on the street or at the track, a performance radiator is a must-have for both high-horsepower builds and race vehicles needing added cooling performance in motorsport environments.

The 2-row core uses CSF's exclusive B-Tube technology. Rather than a regular oval "O"-shaped tube, CSF uses a specially engineered tube shaped like a "B", carefully formed and brazed over the seam to seal. This increases the heat transfer surface area of the tubes by approximately 15% over regular tubes, delivering the efficiency of two smaller tubes versus one large tube within the same space, and allows CSF to use thinner, lighter aluminium with better cooling efficiency, since this design is actually stronger than normal welded "O"-shaped tubes. High-efficiency, multi-louvered fins are precisely aligned to maximise airflow through the core, with fin specifications carefully measured and wind-tunnel tested for this specific application. An all-aluminium racing-style drain plug allows for quick and reliable fluid changes, and CNC-machined mounting brackets round out a design intended as a true drop-in fit with no modifications necessary.

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

Why Choose This Radiator

• CSF's exclusive B-Tube core technology, approximately 15% more heat transfer than regular tubes
• All-aluminium racing-style drain plug for quick and reliable fluid changes
• CNC-machined mounting brackets for precise, durable fitment
• One-hour hand-polished mirror finish
• Rigorously tested via burst pressure, thermal cycle, vibration, and salt spray testing
• Available with a built-in oil cooler and GReddy thermostatic sandwich plate (#3076O), sold as a separate variant#

Compatibility

• Subaru Impreza WRX/STI (2002-2007, with filler neck)
• Subaru Baja (2004-2006, manual transmission)

Fitment note: while designed as a drop-in fit, some real-world installs have reported needing to trim a small amount (roughly 1/2 to 3/4 inch) from surrounding trim on certain early Bugeye-generation cars. Worth flagging this possibility to customers rather than promising a guaranteed zero-modification fit.