Performance Cylinder 4 Coolant Mod for Subaru WRX STI EJ20/EJ25 Engines Lift Kits providing a noticeable increase in

providing a noticeable increase in horsepower

ensuring proper engine placement and alignment for both street and race builds

An easy-to-follow installation tips sheet can be found on our site to make installation as worry-free as possible

and the included silencer makes it easy to reduce sound for daily driving

Performance Cylinder 4 Coolant Mod for Subaru WRX STI EJ20/EJ25 Engines Lift Kits providing a noticeable increase inDescription 100% Brand New Color: BLACK Cylinder 4 Coolant Mod for Subaru EJ Engines was designed to increase coolant flow to cylinder #4 head area. The additional coolant flow helps reduce cylinder #4 coolant temps and keeps the temps more uniform with the rest of the cylinders. This helps reduce knock and detonation in cylinder #4, which is known to cause the dreaded EJ ringland failure Compatible with All EJ20 EJ25 engines 2002 2014 Subaru WRX 2004