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Heating and Cooling› Water Pumps

GDT

Cylinder 4 Chamber Cooling System

Name: Cylinder 4 Chamber Cooling System
Brand: GDT
SKU: CoolingSystem-EJ

$79.00

SKU: CoolingSystem-EJ

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$100 Minimum Order

Non-Returnable Item

DIY PRO SHOP

Moderate — 2–4 hours

Overview

The GDT Cylinder 4 Chamber Cooling System is an engine cooling kit designed to increase coolant flow in the left-hand cylinder head of Subaru EJ engines. This system aims to improve reliability by reducing detonation-causing hot spots. The kit includes a custom-formed NBR hose, a machined aluminum T-fitting, and worm clamps.

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The GDT Cylinder 4 Chamber Cooling System is engineered to be the industry's first Subaru DOHC EJ Cylinder 4 Combustion Chamber Cooling kit. Its primary function is to increase coolant flow specifically to the left-hand cylinder head. This targeted improvement helps reduce detonation-causing hot spots, thereby enhancing engine reliability and potentially lowering Exhaust Gas Temperatures (EGTs). It also includes a custom-machined and anodized 6061 fitting, an aluminum alloy 5/8 T-fitting, and durable 316SS or 304SS embossed worm clamps. This cooling kit is compatible with a range of Subaru models featuring EJ20 and EJ25 engines. Specifically, it fits the 2002-2014 Subaru WRX, 2004-2021 Subaru STI, 2004-2008 Subaru Forester XT, and 2005-2009 Subaru Legacy GT.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

Brand	GDT
Part Number	CoolingSystem-EJ
Category	Heating and Cooling

Videos

GetaDomTune Cylinder 4 Chamber Cooling System - What's in the Box

How To Install A Cylinder 4 Cooling Mod On A Subaru STI | GETADOMTUNE | + GIVEAWAY WINNER

GETADOMTUNE cylinder 4 cooling mod. How to by Mike Foss

Cylinder Head Cooling Modification Release

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Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

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