Mishimoto MMRAD-STI-08X X-Line Aluminum Radiator for 2008-2014 WRX/2008-2021 STI

Vehicle Fitment

• 2008-2014 Subaru WRX (All Trims, AWD) with 2.5L Turbo EJ255 - Manual Transmission
• 2008-2021 Subaru WRX STI (All Trims, AWD) with 2.5L Turbo EJ257 - Manual Transmission

Features

• X-Line performance radiator engineered for enhanced cooling on Subaru turbo engines
• Triple-row, 2.0" thick brazed aluminum core for maximum thermal dissipation vs stock
• Thinner core tubes increase surface contact and improve heat transfer efficiency
• Greater density of rows for superior cooling capacity under spirited, street, or track use
• Includes magnetic drain plug to capture metallic debris and help protect cooling system
• Comes with a high-pressure 1.3 bar radiator cap and a second expansion tank cap for proper dual-cap systems
• Direct OEM fit with no cutting or modification required for compatible vehicles
• 100% brazed aluminum with TIG-welded end tanks for long-term durability
• Mishimoto Lifetime Warranty for peace of mind

Specifications

• Material: 100 % brazed aluminum with TIG-welded end tanks
• Core Rows: 3
• Core Height: ~27.1"
• Core Length: ~13.39"
• Core Thickness: ~2" (50 mm)
• Overall Height: ~28"
• Overall Length: ~21.8"
• Overall Width: ~2.5"
• Inlet Size: ~1.54"
• Outlet Size: ~1.54"
• Drain Plug Thread Size: M12 x 1.5
• Transmission Cooler: Not integrated - optional cooler recommended for automatic/CVT

Included Components

• 1x Mishimoto X-Line performance aluminum radiator
• 1x High-pressure 1.3 bar radiator cap
• 1x Expansion tank radiator cap
• 2x Coolant overflow nipples
• 1x Magnetic drain plug
• Fan mounting hardware
• Mishimoto Lifetime Warranty documentation

Product Description

The Mishimoto MMRAD-STI-08X X-Line performance radiator is a high-capacity cooling upgrade designed specifically for **2008-2014 Subaru WRX and 2008-2021 Subaru WRX STI** models equipped with 2.5L turbo EJ series engines. Featuring a robust triple-row, 2" thick brazed aluminum core and thinner fluid tubes for increased surface contact, this radiator significantly improves heat dissipation and coolant capacity compared with many stock radiators. These enhancements make it an excellent choice for street driving, track days, rally events, or other high-load driving conditions where keeping coolant temps under control is essential.

Installation is direct-fit, using factory mounting points with no cutting or modification required. The X-Line radiator includes both a high-pressure 1.3 bar radiator cap and a separate expansion tank cap to properly interface with Subaru's dual-cap cooling system, along with overflow nipples, a magnetic drain plug, and fan mounting hardware. Backed by Mishimoto's Lifetime Warranty, the MMRAD-STI-08X delivers reliable cooling performance and durability for WRX and STI owners looking to upgrade beyond stock cooling capacity.