Performance Cylinder 4 Coolant Mod for Subaru WRX STI EJ20/EJ25 Engines WASH & WHIPS With proven performance and dependable

With proven performance and dependable construction

After privately supporting several B58 engine builds for customers who experienced failures elsewhere

increased torque load

reusable deep-pleat red filter media provides superior filtration without restricting airflow

Performance Cylinder 4 Coolant Mod for Subaru WRX STI EJ20/EJ25 Engines WASH & WHIPS With proven performance and dependableDescription 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