Mishimoto 2001-2007 Subaru WRX and STi Manual X-LINE (Thicker Core)

This Mishimoto performance aluminum radiator is a direct-fit upgrade for 2002-2007 Saab/Subaru applications covering 9-2X Aero, Impreza WRX, Impreza WRX STI, Impreza WRX TR. It replaces the weak points of the stock part with stronger materials and better flow or cooling so heat, boost and abuse stay under control on street and track duty. AutoTalent lists verified US-market fitment in the table below.

Why upgrade

When properly maintained, the Subaru flat-four is well known for its substantial power and impressive reliability. Proper regulation of coolant temperature is key to extending the life of your EJ-powered Subaru. Mishimoto engineers these kits around real chassis packaging, so hoses, coolers and adapters line up without fabrication on the listed years. Follow the published torque specs and install guide, reuse sensors where instructed, and confirm clearances if you run other supporting mods. Every unit ships with the Mishimoto Lifetime Warranty for as long as you own it.

Features

• Three-row aluminum core provides substantial additional coolant capacity and surface contact area — built to sustain consistent temperatures even in the most demanding WRX environments.
• Full aluminum construction delivers improved heat dissipation and pressure tolerance the plastic-tank factory unit cannot match under boost and heat cycling.
• Two 1.3 bar high-pressure caps, two-way expansion tank cap, one-way radiator cap, and Magnetic Drain Plug included — every piece needed for a complete cooling system install.
• TIG-welded aluminum end tanks replace the factory plastic components that fail under the heat cycles and pressure spikes of a turbocharged cooling system.
• Three-row brazed aluminum core with increased coolant capacity directly improves cooling efficiency — more fluid volume means more thermal buffer before temps climb.
• Confirmed direct fit for the WRX platform — drops in without cutting, fabricating, or adapter work, compatible with the stock cooling system configuration.
• Designed for stock and modified WRX builds — handles the thermal output of stage-tuned and high-boost setups without additional modification.

What's Included

• (1) Mishimoto Radiator
• (1) Mishimoto Two-Way Radiator Cap
• (1) Mishimoto One-Way Radiator Cap
• (1)1/16-inch NPT Plug
• (1) Magnetic Drain Plug
• Fan Mounting Hardware
• Mishimoto Lifetime Warranty

Specifications

Fitment Notes

Verified against Mishimoto US applications and dealer listing for 2002-2007 (4 rows). Years extended to 2027 where the US model remains in production.

Vehicle Fitment