CSF 6th Gen Subaru Outback/Legacy High-Performance All-Aluminum Radiator

The CSF 6th Gen Subaru Outback/Legacy High-Performance All-Aluminum Radiator is engineered to meet the demanding cooling requirements of the robust 2.5L (FB25) naturally aspirated engine, particularly under the strenuous conditions encountered during off-roading and overlanding. These activities impose significant stress on the engine due to factors such as traction loss, steep inclines, and the additional weight of gear, often resulting in elevated operating temperatures. The factory radiator may not adequately manage these increased thermal loads, which can compromise engine performance and longevity. To address this challenge, CSF has developed a high-performance radiator that enhances cooling efficiency and durability for the Subaru Legacy and Outback models. At the core of this radiator is a 42mm thick, 2-row aluminum core that significantly increases the fluid capacity compared to stock units. This design not only allows for greater coolant volume but also improves heat dissipation capabilities. CSF’s exclusive B-Tube Technology further advances thermal management by enhancing heat transfer by approximately 15% over conventional oval welded tubes. Complementing this innovation, the radiator incorporates multi-louvered fins that maximize airflow through the core, thereby optimizing heat exchange efficiency. This is particularly important in off-road scenarios where vehicle speeds are generally lower, and cooling relies heavily on fan-driven airflow rather than natural ram air. While factory fans provide a baseline level of airflow, they are often insufficient to maintain optimal engine temperatures during low-speed, high-load conditions typical of off-road driving. The larger and more efficient core of the CSF radiator ensures that engine temperatures remain within safe operating limits, promoting consistent engine performance and reliability. Additionally, the increased core size offers a buffer against reduced cooling efficiency caused by environmental contaminants such as dust, dirt, and mud, which frequently accumulate on radiators in rugged terrains. By providing greater overall cooling capacity, this radiator mitigates the risk of overheating even when airflow is partially obstructed. Durability and structural integrity are paramount in the design of this radiator. The end tanks are fabricated from high-grade aluminum and are TIG welded to the core, delivering superior strength and resistance to failure compared to the OEM design, which utilizes plastic end tanks crimped onto the core—a known weak point prone to leaks and damage. This all-aluminum construction ensures a robust and long-lasting cooling solution capable of withstanding the rigors of demanding driving conditions. Installation is straightforward and user-friendly, as the CSF radiator is designed as a true plug-and-play, drop-in fit replacement. This eliminates the need for any modifications, trimming, or cutting, allowing for a seamless upgrade that maintains factory fitment standards and vehicle aesthetics. Features 2-Row – 42mm Ultra-High-Performance Core for enhanced cooling capacity Cooling Tubes incorporating CSF’s Exclusive B-Tube Technology for approximately 15% improved heat transfer 6.5mm Tall Ultra Efficient Fins with a Multi-Louvered Design to maximize surface area contact and airflow CNC Machined Mounting Brackets and OEM Style Inlet/Outlet for precise fitment and durability 100% All Aluminum TIG-Welded Construction ensuring superior strength and longevity Smooth Satin Finish providing corrosion resistance and professional appearance True Plug-and-Play “Drop-in Fit” Installation requiring absolutely no modifications Individually Leak and Pressure Tested to guarantee reliability and performance 2-Year Limited Warranty reflecting CSF’s commitment to quality and customer satisfaction Applications Year Range Make Chassis Code Model Trim Engine / Trans / Etc Notes 2015-2019 Subaru 6th Gen Legacy 2.5i 2.5L H4 – 2015-2019 Subaru 6th Gen Legacy 2.5i Limited 2.5L H4 – 2015-2019 Subaru 6th Gen Legacy 2.5i Premium 2.5L H4 – 2017-2019 Subaru 6th Gen Legacy 2.5i Sport 2.5L H4 – 2015-2019 Subaru 6th Gen Legacy 2.5i Touring 2.5L H4 – 2015-2019 Subaru 5th Gen Outback 2.5i 2.5L H4 – 2015-2019 Subaru 5th Gen Outback 2.5i Limited 2.5L H4 – 2018-2019 Subaru