The 2003-2009 Toyota 4Runner V8 is known for its ruggedness, reliability, and off-road capability, but as they grow older the stock parts are starting to show their age. Over time, the factory radiator can develop issues such as leaks, corrosion, or clogging. Upgrading to a new Mishimoto performance aluminum radiator can prevent these problems before they occur, saving you from potential breakdowns on the trail. For those who use their 2003-2009 Toyota 4Runner for off-roading, this radiator can handle the additional strain and heat generated during these activities, providing better reliability and performance in rugged conditions. Our direct-fit radiator features a 40mm thick core for increased cooling capacity. Constructed entirely from aluminum with durable, TIG-welded end tanks, it includes an efficient in-tank liquid-to-liquid stacked plate transmission cooler for optimal transmission fluid temperature control. The radiator also comes with a magnetic drain plug to capture metallic debris in your cooling system and is backed by the Mishimoto Lifetime Warranty for peace of mind.