Keep your Subaru’s flat-four running cool under any conditions with the Mishimoto X-Line Performance Aluminum Radiator. Whether you’re commuting daily or chasing lap times at the track, an efficient cooling system is essential to prevent overheating and protect your engine from costly damage. The factory radiator can struggle under demanding conditions, but the Mishimoto X-Line Radiator is engineered to deliver maximum cooling efficiency and long-lasting durability for the 2008–2014 WRX and 2008–2021 STI.

This premium radiator features a triple-row, 2-inch thick core for improved heat dissipation and reliability. The 100% brazed aluminum construction with TIG-welded polished end tanks provides exceptional strength and longevity, while the lightweight design helps maintain vehicle balance and performance. With a direct OEM fit, installation is straightforward and requires no modifications.

Every Mishimoto X-Line Radiator includes a high-pressure 1.3 bar radiator cap to raise the boiling point of your coolant, offering additional protection against overheating, plus a second radiator cap for use on the expansion tank. The magnetic drain plug captures metallic debris, helping to prolong the life of your cooling system.

Features:

• Direct fit for 2008–2014 Subaru WRX / 2008–2021 Subaru STI
• Premium 3-row (2” thick) core for improved cooling strength and reliability
• 16% thinner-than-stock tubes increase surface contact and heat transfer
• Higher density of rows for greater cooling capacity
• Triple-row design creates air turbulence for maximum cooling efficiency
• Includes two 1.3 bar high-pressure caps for a higher boiling point
• Two-way expansion tank cap and one-way radiator cap ensure proper coolant flow
• Magnetic drain plug captures metallic debris for longer system life
• Lightweight, durable aluminum construction with TIG-welded polished end tanks

Includes:

• (1) Mishimoto Radiator
• (1) Mishimoto Two-Way Radiator Cap
• (1) Mishimoto One-Way Radiator Cap
• (2) Overflow Ports
• (1) Magnetic Drain Plug
• Fan Mounting Hardware

Notes: 

• The provided Mishimoto two way cap (six-sided design) should replace the stock cap located on the expansion tank. The Mishimoto Performance Aluminum Radiator should utilize the included one way cap (circular design with non-directional sticker).
• Use small fitting for:
  2008-2009 Subaru WRX, 2008-2019 Subaru STI
• Use large fitting for:
  2010-2014 Subaru WRX, 2005-2009 Subaru Legacy GT, 2005-2009 Subaru Outback XT, 2009-2013 Subaru Forester XT