GetaDomTune
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The best cylinder 4 cooling upgrade for a Subaru EJ engine is a dedicated chamber cooling system made for your model, and that is the whole of this collection: the GetaDomTune Cylinder 4 Chamber Cooling System in a metal-fitting version listed for the 2004-2021 STI and 2002-2014 WRX, a version listed for EJ motors, and a plastic T version listed for Subaru models. Check your year and model before ordering.
On Subaru EJ engines, the cylinder 4 area is the far end of the factory coolant path, and this system is designed to improve coolant circulation to that chamber. It is a coolant-routing part, not a radiator or a tune: it works alongside the rest of the cooling system. The metal-fitting version names its STI and WRX years in the title; choose between metal fitting and plastic T based on how the car is used.
GetaDomTune is the only brand in this collection, and its range here is a single product family done three ways: metal fitting, plastic T, and a listing written for EJ motors generally. That narrow focus is the point — the listing exists to address cylinder 4 cooling on EJ-powered Subarus, making it the specialist option in the cooling aisle for an EJ STI or WRX.
Killer B is the Subaru EJ specialist most cooling shoppers already know, covering oil pickups, pans, and other EJ hardware for keeping a hard-used flat-four alive, pairing naturally with a cylinder 4 cooling system. Browse Killer B when you are reinforcing the engine at the same time.
IAG Performance covers the built-engine side of the EJ world, from short blocks to supporting hardware for high-power Subaru builds. Owners usually address cooling, oiling, and internals as one package. See IAG Performance for its Subaru engine range.
Mishimoto supplies the mainstream cooling hardware this system complements — radiators, hoses, and fans. Start with the full Mishimoto range, then shop Cooling and Performance Radiators, and read Subaru EJ257 Engine: Everything You Need To Know on the JDMuscle blog for EJ background.
Which GetaDomTune version fits my Subaru?
The metal-fitting version is listed for the 2004-2021 STI and 2002-2014 WRX (CYL4COOL-SS); the plastic T version is listed for Subaru models generally and a third listing covers EJ motors. Check your year and model if your application is not named.
Metal fitting or plastic T — which should I choose?
Both are the same system concept with different fitting construction: metal fitting for owners who prefer metal hardware, plastic T for general Subaru applications. Choose by your build and the listing that names your model.
How difficult is the install?
The system ties into the coolant plumbing, so expect to drain, connect, refill, and bleed air afterward. Access varies by model; many owners have a Subaru shop handle it with other cooling work. Budget for fresh coolant.
Do I need a tune after installing a cylinder 4 cooling system?
This is coolant-routing hardware, not an airflow or fueling change, so it does not by itself change engine calibration the way an intake or downpipe would. On a tuned car, a quick word with your tuner is still good practice.