CSF Subaru Legacy/Outback (2.5L AT/MT) 2015-2019 High-Performance Radiator

Wagons and some sedans have become genuinely popular platforms for enthusiasts seeking fun away from the concrete jungle, and Subaru is naturally one of the more popular manufacturers in the off-road and overland scene, with the Legacy, and particularly the Outback, becoming favourite platforms to build on. With standard AWD, decent ground clearance, and reasonably good fuel economy, it's not surprising to see more of them on the trails. The stout 2.5L (FB25) naturally aspirated motor is genuinely well suited to off-roading and overlanding, but those activities can be a lot harder on it than you might expect.

Between dealing with traction loss, steep inclines, and the added weight of gear, there's almost always more strain on the engine, resulting in above-average operating temperatures that the factory radiator can struggle to keep up with. That's why CSF developed this High-Performance All-Aluminum Radiator for the Legacy/Outback. The 42mm, 2-row aluminium core not only increases fluid capacity but also improves the core's ability to dissipate heat, using CSF's exclusive B-Tube technology to increase heat transfer by approximately 15% over regular oval welded tubes. Super-efficient, multi-louvered 6.5mm tall fins maximise airflow through the core, which matters especially in off-road driving, where lower speeds mean you rely more heavily on the factory fans to move air through the radiator than you would at typical city speeds. A larger, more efficient core also helps when the radiator inevitably gets covered in dust, dirt, or mud, since more overall cooling capacity gives you a better margin even when it isn't operating at peak efficiency. End tanks are made from high-grade aluminium and TIG-welded to the core for genuine strength, in contrast to the OEM's crimped-onto-plastic design, a well-documented weak point where failure is more likely. This is a true plug-and-play drop-in fit, requiring absolutely no modifications, trimming, or cutting to install.

Works with: OEM mounting hardware. Fits both AT and MT transmissions.

Why Choose This Radiator

• CSF's exclusive B-Tube core technology, approximately 15% more heat transfer than regular tubes
• Purpose-built for off-road and overland demands, not just street driving
• 6.5mm multi-louvered fins, maximise airflow at the lower speeds typical of off-roading
• TIG-welded aluminium end tanks, eliminating the OEM's weaker crimped plastic design
• True plug-and-play drop-in fit, no modifications, trimming, or cutting required
• Fits both AT and MT transmissions

Compatibility

• Subaru Legacy (2015-2019, 2.5L FB25, AT/MT)
• Subaru Outback (2015-2019, 2.5L FB25, AT/MT)

Also available: CSF's matching A/C Condenser for this same platform, sold separately, for a complete cooling and climate system upgrade.