Subaru Impreza WRX/STI X-Line Performance Radiator, 2002-2007When 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. Highly modified turbocharger setups and aggressive driving can result in high temperatures, which increases wear on internal engine components. Mishimoto's X line radiator is engineered specifically for the 2001 2007 Subaru WRX and STI and