Precision Works Cylinder 4 Coolant Mod Subaru EJ Engines

Eliminate dangerous hot spots and prevent catastrophic engine failure with improved coolant flow to your Subaru's most vulnerable cylinder. This direct-fit performance upgrade solves the cylinder 4 temperature imbalance that plagues EJ-series engines, reducing knock, detonation, and ring land failure risk.

• •Increases coolant flow specifically to cylinder 4
• •Evens out cylinder temperatures across all four cylinders
• •Reduces detonation and engine knock
• •Prevents ring land failure
• •6061 billet aluminum construction with precision CNC machining
• •Multi-layer silicone hose with stainless steel clamps included

**Fitment:** Subaru WRX (2002-2014), Subaru STI (2004+), EJ20 and EJ25 engines