Note: Some Modifications Needed for installation. See details below.

CSF manufactures the most advanced and efficient radiator cores in the industry by using innovative tube and fin technologies with industry-leading testing methods to maximize airflow and heat dissipation. These techniques allow CSF to stay ahead of the pack when it comes to radiator technology.

Integrated Oil Cooler

It's been a productive 2015 year for CSF's Racing & High Performance division, and one of our most innovative product lines so far has been our innovative "O"� Series line of race-spec all-aluminum radiators with built-in oil coolers!

The CSF "O" Series Radiator for Subaru WRX and STI was developed alongside industry leading Subaru engine builders & race tuners, LIC Motorsports from Northern California. CSF also reached out to one of our closest race teams, Subaru tuners, and dealers; Snail Performance, to help with fitment and performance testing in the hot Arizona desert they are regionally located in.

B-TUBE TECHNOLOGY

Unlike a regular oval shape "O"� type radiator tube, CSF uses a specially engineered tube in a shape of a "B."� These "B-tubes"� are carefully formed and then brazed over the seam to seal. CSF is able to use thinner and lighter aluminum material (with better cooling efficiency) because this design is actually stronger than normal "O"� shape tubes that are welded.

The design (inlet in the middle of tube that is seam brazed) increases the heat transfer surface area of the tubes by approximately 15% over regular tubes "“ producing the efficiency of two smaller tubes vs. one large tube within the same space criteria. With "B-tubes"� you are able to get "dual liquid laminar flow."�

High Efficiency multi-louvered fins

CSF uses ultra efficient multi louvered fins that are carefully and precisely aligned to maximize a