All EJ20 / EJ25 engines. 2002 - 2014 Subaru WRX. Cylinder 4 Coolant Mod for Subaru EJ Engines was designed to increase coolant flow to cylinder #4 head area. 2004 - 2020 Subaru STI. 1X Cylinder 4 Coolant Mod.
Roger Clark Motorsport Cylinder 4 Cooling Mod Kit Street Spec for Subaru
Roger Clark Motorsport Cylinder 4 Cooling Mod Kit (Blue) for 02-14 WRX & 04+ STi
Roger Clark Motorsport Cylinder 4 Cooling Mod Kit (Matte Black) for WRX & STi
Roger Clark Motorsport Cylinder 4 Cooling Mod Kit (Red) for 02-14 WRX & 04+ STi
Cylinder 4 Cooling Mod Kit For Subaru WRX FXT STI LGT For EJ20 EJ25 Engines
UPR 4.6 HD Head Cooling Mod HCM Compatible with 1996-2004 Ford Mustang Cobra
