Premium radiator has 3-row (2" thick) core for improved strength and reliability. 16% thinner-than-stock tubes allow for more surface contact, increasing cooling efficiency. Greater density of rows for higher cooling capacity. More contact points for additional heat transfer. 3-row design creates more air turbulence, maximizing cooling efficiency Includes magnetic drain plug Includes a high-pressure 1.3 bar Mishimoto radiator cap Mishimoto Lifetime WarrantyThe Mishimoto X-Line performance aluminum radiator for the 2008-2014 Subaru WRX and 2008-2015 STI is designed with a larger 3-row core to maximize cooling efficiency, boost engine functions, and most importantly protect your car from overheating. It is the ideal upgrade to the stock Subaru radiator whether you drive your vehicle daily or take it for track runs. The Mishimoto aluminum WRX and STI radiator features a lightweight triple core, 100% brazed aluminum, and polished end tanks, enhancing the overall performance of your engine. Every Mishimoto aluminum radiator is a direct stock fit making installation effortless with no cutting or modification required. All Mishimoto radiators come with a high pressure 1.3 bar Mishimoto radiator cap and, like all our aluminum radiators, this product comes with the unparalleled Mishimoto Lifetime Warranty.