CSF 08-15 Subaru Impreza WRX/STI 1-Row 31mm High-Performance Aluminum Radiator - Black

CSF has been making radiators for over 50 years, so they know a thing or two about keeping engines cool. If you're looking to upgrade the cooling system on your Subaru WRX or STI, especially for higher horsepower builds or track use, this CSF High-Performance All-Aluminum Radiator is a solid choice. It’s designed to handle the extra heat that comes with pushing your engine harder.

What sets this radiator apart is CSF's B-Tube Technology. Instead of standard oval tubes, they use a specially shaped 'B' tube that's seam-brazed. This design is stronger, allows for thinner and lighter aluminum, and increases the heat transfer surface area by about 15% compared to regular tubes. It effectively acts like two smaller tubes in one, creating a dual liquid laminar flow for better cooling. Combined with ultra-efficient, multi-louvered fins precisely aligned to maximize airflow, this radiator is built for serious heat rejection. The core is 31mm thick and features 6.5mm tall fins for maximum contact. It’s a true drop-in fit, meaning no modifications are needed for installation, and it uses OE-style CNC machined brackets for durability. This version is for manual transmissions only and has a black finish for a stealthy look.

This radiator fits a wide range of Subaru models, including the Impreza, WRX, STI, Forester, Legacy, and Outback from various years. It's individually leak and pressure tested before it leaves the factory, so you can trust it to perform reliably.