Mishimoto 08-09 Subaru WRX/STi Manual Aluminum Radiator

SKU: MISMMRAD-STI-08

Radiators

MM Radiators - Alum...

Mishimoto

Mishimoto 08-09 Subaru WRX/STi Manual Aluminum Radiator

SKU: MISMMRAD-STI-08

Radiators

MM Radiators - Alum...

IN STOCK! Est Ship 3-5 days. In stock at 1 location (more than 10 available)

We accept

Description

Exclusive Mishimoto flash sale discount at StreetFX!

Talk about timing! This is a limited offer while stocks last on various Mishimoto part numbers. There's never been a better time to buy your Mishimoto upgrades, so what are you waiting for?!

This item is currently on sale!

Same-day payment required to secure promotional price. Promotions may end early or be extended based on stock levels or other factors.

Mishimoto 08-09 Subaru WRX/STi Manual Aluminum Radiator

Whether you're carving through back roads in your WRX or pushing your STI to the limit on track day, maintaining optimal coolant temperatures is essential to protecting your EJ engine. The factory radiator's plastic end tanks and limited cooling capacity can quickly become a weak link, especially under the high demands of spirited driving or hot summer commutes. A failure in the cooling system can lead to overheating, head gasket issues, and costly repairs that cut your driving adventures short. The Mishimoto Performance Aluminum Radiator for the 2008–2014 Subaru WRX and 2008–2021 Subaru STI is engineered to be the ultimate safeguard for your engine, delivering improved cooling efficiency and durability over stock. -- Built with a lightweight, dual-core design and 100% brazed aluminum construction, this radiator maximizes heat dissipation and withstands higher pressures to keep your engine performing at its best. The TIG-welded, polished end tanks add strength and a premium finish, while the direct-fit design ensures a straightforward installation with no cutting or modification required. The included high-pressure 1.3 bar radiator cap raises the boiling point of your coolant for an extra margin of safety under heavy loads, and a second radiator cap is included for use on the expansion tank. With up to a 30% increase in cooling efficiency over the factory unit, this upgrade is ideal for daily driving, spirited runs, or competitive use. -- Backed by the Mishimoto Lifetime Warranty, including accident protection, this radiator is built to keep your Subaru running strong for years to come.

Additional Information

Aluminum radiator engineered for efficient heat dissipation and optimal engine cooling. Precision-fit design ensures easy installation, corrosion resistance, and reliable performance across varied driving conditions.

Application Summary

2008-2014 Subaru Impreza WRX 2.5 Liter TY758, 2008-2014 Subaru Impreza WRX 2.5 Liter TY758, 2008-2014 Subaru Impreza WRX 2.5 Liter TY758, 2008-2014 Subaru Impreza WRX 2.5 Liter TY758, 2008-2014 Subaru Impreza WRX 2.5 Liter TY758, 2008-2014 Subaru Impreza WRX 2.5 Liter TY758, 2008-2014 Subaru Impreza WRX 2.5 Liter TY758, 2010-2014 Subaru Impreza WRX Limited 2.5 Liter TY758, 2010-2014 Subaru Impreza WRX Limited 2.5 Liter TY758, 2010-2014 Subaru Impreza WRX Limited 2.5 Liter TY758, 2010-2014 Subaru Impreza WRX Limited 2.5 Liter TY758, 2010-2014 Subaru Impreza WRX Limited 2.5 Liter TY758, 2009-2014 Subaru Impreza WRX Premium 2.5 Liter TY758, 2009-2014 Subaru Impreza WRX Premium 2.5 Liter TY758, 2009-2014 Subaru Impreza WRX Premium 2.5 Liter TY758, 2009-2014 Subaru Impreza WRX Premium 2.5 Liter TY758, 2009-2014 Subaru Impreza WRX Premium 2.5 Liter TY758, 2009-2014 Subaru Impreza WRX Premium 2.5 Liter TY758, 2008-2014 Subaru Impreza WRX STI 2.5 Liter TY856, 2008-2014 Subaru Impreza WRX STI 2.5 Liter TY856, 2008-2014 Subaru Impreza WRX STI 2.5 Liter TY856, 2008-2014 Subaru Impreza WRX STI 2.5 Liter TY856, 2008-2014 Subaru Impreza WRX STI 2.5 Liter TY856, 2008-2014 Subaru Impreza WRX STI 2.5 Liter TY856, 2008-2014 Subaru Impreza WRX STI 2.5 Liter TY856, 2011-2014 Subaru Impreza WRX STI Limited 2.5 Liter TY856, 2011-2014 Subaru Impreza WRX STI Limited 2.5 Liter TY856, 2011-2014 Subaru Impreza WRX STI Limited 2.5 Liter TY856, 2011-2014 Subaru Impreza WRX STI Limited 2.5 Liter TY856, 2010 Subaru Impreza WRX STI Special Edition 2.5 Liter TY856, 2005-2006 Subaru Legacy GT 2.5 Liter TY757, 2005-2006 Subaru Legacy GT 2.5 Liter TY757, 2005 Subaru Legacy GT Limited 2.5 Liter TY757, 2007 Subaru Legacy GT Limited 2.5 Liter TY757, 2005 Subaru Legacy GT Limited 2.5 Liter TY757, 2007 Subaru Legacy GT Limited 2.5 Liter TY757, 2008-2009 Subaru Legacy GT Limited 2.5 Liter TY758, 2008-2009 Subaru Legacy GT Limited 2.5 Liter TY758 ...See Application Guide for Additional Fitments

Part Type

Radiator

Product Overview

Data: v4.2 - Upd: 2026-11-09 15:35:07

Features

Features a two-row, 1.65 thick brazed aluminum core
Full aluminum construction features durable, TIG-welded end tanks
Increased coolant capacity directly results in improved cooling efficiency

Images are supplied by the manufacturer and may be generic. While all efforts are made to provide accurate pictures, there may be differences in the actual product, such as colour, quantity, version, or included components. Please carefully review the description and specifications for details on inclusions or any variations. Some items may be sold individually or in sets, and images may occasionally depict additional products or quantities not included in your purchase. For assistance or clarification, please contact customer support.

Specifications

Product Details

Alternate Part Number:	MMRAD-STI-08
Description:	Mishimoto Subaru Impreza WRX/STI Performance Aluminum Radiator
Dimensions:	28" x 21.8" x 2.15"
Install Difficulty:	3
Installation Difficulty:	3
Material:	Aluminum
Part Number:	misMMRAD-STI-08
Feature 1:	Direct fit for the 2008-2019 Subaru WRX/STI
Feature 2:	Full aluminum construction including durable, TIG-welded end tanks
Feature 3:	Features a two-row, 1.65-in thick, efficient brazed aluminum core
Feature 4:	Increased fluid capacity and optimal heat dissipation
Feature 5:	Provides efficient temperature reduction for use on the street, track, rallycross, or autocross course
Feature 6:	Includes 1.3 Bar High-Pressure Radiator Cap which effectively raises the boiling point of engine coolant, providing a safer and more efficient system
Feature 7:	Includes Magnetic Drain Plug to capture any metallic debris/fragments in your cooling system
Feature 8:	Mishimoto Lifetime Warranty
Size:	28in x 21.8in x 2.15in
TechSpec Applications:	2008-2014 Subaru WRX--2008-2019 Subaru STI--2009-2013 Subaru Forester XT--2005-2009 Subaru Outback XT--2005-2009 Subaru Legacy GT
TechSpec Chassis Codes:	GE--GH
TechSpec Core Height (in):	13.39
TechSpec Core Length (in):	27.08
TechSpec Core Thickness (in):	1.65
TechSpec DPI:	13091/13093
TechSpec Drain Plug Thread Size:	M12 x 1.5
TechSpec Engine Codes:	EJ255--EJ257
TechSpec Fluid Capacity (gal):	2.21
TechSpec Includes:	Mishimoto Radiator--Mishimoto Radiator Cap--Overflow Nipples - 2--Magnetic Drain Plug--Mishimoto Lifetime Warranty
TechSpec Inlet (in):	1.54
TechSpec Note:	This item is for Manual Transmission vehicles. For automatic applications, please purchase optional Mishimoto Universal Transmission Cooler Kit.----Caution:--The provided Mishimoto radiator cap should replace the stock cap located on the expansion tank. The stock cap attached to the radiator should be installed on the Mishimoto Performance Aluminum Radiator. The Mishimoto radiator cap is a two-way valve, while the stock radiator cap is a single valve. Due to the difference in construction, the M
TechSpec Outlet (in):	1.54
TechSpec Overall Height (in):	21.8
TechSpec Overall Length (in):	28
TechSpec Overall Width (ins):	2.15
TechSpec Rows:	2

Product Downloads

#	Document Type	Download
1.	Installation Instructions

Installation guides, warranty details, and other supporting documents are provided by the supplier. In some cases, these files may originate from regions outside your locale, meaning instructions, warranty procedures, and images may not fully align with your specific vehicle or region (e.g., LHD vs. RHD differences, return policies, etc.). If you need clarification, please contact a StreetFX support agent.

Data: v2 - Desc: v4.2 - Upd: 2026-11-08 05:54:22

Reference Information

Reference Data (Provide these details to our support team)
Brand Name/s	Mishimoto
StreetFX SKU	misMMRAD-STI-08
SFX Item ID	4051406
Accounting SKU	mis-MMRAD-STI-08
Manufacturer SKU	MMRAD-STI-08
Manufacturer UPC	748354798852
Alternative References	MIMMMRAD-STI-08, MIO-MMRAD-STI-08, MMRAD-STI-08

Radiator, Downflow, Dual-row, Aluminum, Natural, Subaru, 2.5L, Manual, Each

Mishimoto performance radiators are designed and engineered to maximize cooling efficiency, boost engine functions, and, most of all, protect your engine from overheating. Many stock radiators can't handle the additional heat that comes higher horsepower levels. So, swap out your stock radiator for an all-aluminum Mishimoto.

Key features and benefits of Mishimoto performance radiators include:
• Available for universal and exact fit applications (no cutting or modifications required)
• All-aluminum construction for optimal heat dissipation, improved strength, and reliability
• Increased cooling capacity due to their massive core size
• 100 percent brazed aluminum core for minimal distortion, low stress, and clean joints
• Available in various sizes with 2-row or 3-row cores
• TIG-welded for clean, strong welds and increased durability
• Magnetic drain plugs capture metallic debris or fragments
• Included high-pressure 1.3 bar cap raises the coolant boiling point for greater safety and efficiency
• Automatic transmission and accessory coolers included where applicable

Product Attributes
Brand	Mishimoto
Manufacturer's Part Number	MMRAD-STI-08
Part Type	Radiators
Product Line	Mishimoto Performance Radiators
UPC	748354798852
Radiator Material	Aluminum
Radiator Style	Downflow
Transmission Cooler	No
Inlet Location	Center driver side
Outlet Location	Lower driver side
Overall Width (in.)	28.00 in.
Overall Height (in.)	21.80 in.
Overall Thickness (in.)	2.15 in.
Row Quantity	2
Radiator Finish	Natural
Core Width (in.)	27.08 in.
Core Height (in.)	13.39 in.
Core Thickness (in.)	1.65 in.
Radiator Inlet Size	1.540 in.
Radiator Outlet Size	1.540 in.
Trans Cooler Adapter Fittings Included	No
Fan Included	No
Radiator Cap Included	Yes
Quantity	Sold individually.