Radiator for Subaru Impreza 2008-2014, Legacy 2005-2009, Outback 2005-2009, WRX STI 2015-2016 2.5L H4, Replace MMRAD-STI-08, 2-Row 40mm Core BDFHYK

Restore and upgrade cooling performance with this direct-fit replacement radiator for select Subaru Impreza, Legacy, Outback, and WRX STI applications. Built with a 2-row, 40 mm AA5052 aluminum core and supplied with a CNC-machined radiator cap, it is designed to replace an aged, leaking, clogged, corroded, or damaged factory radiator and help maintain stable engine temperature during daily driving, highway use, warm-weather operation, and performance-oriented vehicle use. 

Vehicle Fitment & OE Reference Numbers

OE / Interchange Reference Numbers: MMRAD-STI-08.

Before ordering: Compare the OE number, core dimensions, overall dimensions, inlet and outlet size, mounting points, drain location, and engine-bay clearance with the original radiator.

Product Specifications & Package Includes

Package Includes: 1 × 2-row 40 mm AA5052 aluminum radiator and 1 × CNC-machined radiator cap.

Signs Your Radiator Needs Replacement

• The engine temperature runs higher than normal or the vehicle overheats.
• Coolant leaks appear around the radiator, seams, hose connections, drain area, or lower corners.
• The coolant level drops repeatedly without an obvious hose leak.
• Cooling fins are bent, clogged, corroded, or damaged.
• The temperature gauge fluctuates during city driving, highway use, or warm-weather operation.
• The original radiator no longer provides stable cooling for a modified or performance-oriented vehicle.

Replacing an aged radiator helps restore coolant circulation and heat transfer, reducing the risk of repeated overheating and related engine damage.

Key Features & Benefits

2-Row 40 mm AA5052 Aluminum Core: Provides increased cooling surface area and supports efficient heat transfer.

Vehicle-Specific Fitment: Designed around compatible Subaru Impreza, Legacy, Outback, and WRX STI mounting and hose locations.

Stable Cooling in Demanding Conditions: Helps support engine temperature during commuting, highway driving, warm weather, and performance-oriented use.

CNC-Machined Radiator Cap Included: Supplied as part of the package for the specified radiator configuration.

Leak Tested: Each radiator is checked before shipment to support dependable cooling-system performance.

Installation Notes & 4-Step Guide

Important: Compare the original radiator dimensions, hose sizes, mounting points, and engine-bay clearance before installation. Professional installation is recommended.

1. Drain: Allow the engine to cool completely, remove the radiator cap carefully, and drain the old coolant into a suitable container.
2. Remove: Disconnect the radiator hoses, overflow hose, fan or shroud components, and factory mounting hardware.
3. Install: Compare the dimensions and connection points, transfer reusable brackets or cushions when required, and install the new radiator using the compatible mounting locations.
4. Refill & Bleed: Reconnect all hoses, refill with the vehicle manufacturer-recommended coolant mixture, bleed trapped air, and inspect all connections for leaks.

After installation: Inspect the hoses, clamps, radiator cap, thermostat, cooling fan, water pump, and engine-bay clearance. Recheck coolant level and all mounting points after the first drive and again after the engine cools.