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

This is a CSF high-performance aluminum radiator, designed to fit a range of Subaru models including the 2008-2014 Impreza WRX/STI and the 2015-2021 WRX/STI. If you're pushing your Subaru hard, whether on the street or at the track, keeping your engine cool is critical, and this radiator is built to handle that demand.

CSF has been making radiators for over 50 years, and this one uses their exclusive B-tube technology. Instead of a standard oval tube, these B-tubes are shaped and brazed to increase the surface area by about 15% compared to regular tubes. This means better heat transfer and more efficient cooling, almost like having two smaller tubes working together. They also use multi-louvered fins that are precisely aligned to maximize airflow through the core, helping to reject heat more effectively. The entire unit is 100% all-aluminum and TIG-welded for solid construction, and it's pressure tested to ensure there are no leaks.

This radiator is designed as a direct fit, meaning it bolts right in without needing any modifications to your vehicle. It uses OE-style brackets that are CNC machined for durability, and the inlet and outlet connections are set up to use your factory hoses. Just a heads-up, this radiator is for manual transmission vehicles only.