The cylinder 4 cooling mod is definitely a must have for any STi owner. I wish I installed it much sooner, might've saved me an engine rebuild! Basically it routes coolant to the cylinder 4 chamber and helps reduce temps which helps reduce detonation! Hopefully this video helps give you guy a better understanding as to how to install the simple mod.

https://getadomtune.com/Documents/Coo...

GetaDomTune Cylinder 4 Cooling Mod:
https://bit.ly/3MlvR9V


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