Cylinder Four Cooling Mod

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Cooler Temps, Smarter Power — Cylinder 4 Cooling Mod for EJ EnginesThe EJ engine is tough, but not perfect. One of its known weak spots? A coolant flow dead zone near cylinder 4. T hat hot spot can lead to uneven temps, knock, and even detonation — especially in tuned or track-driven Subarus. This cooling modification kit fixes the issue by redirecting coolant through that neglected passage, allowing it to recirculate and flow evenly throughout the system. The result? More balanced cylinder temps, less risk of knock, and the ability to tune with confidence — equal timing, equal fueling, equal power. It’s simple, effective, and dyno-proven. Kit Includes: 1x Pre-Cut Coolant Hose 1x Custom-Shaped Hose 1x T-Piece Fitting 1x Billet Cylinder Head Reducer 1x 45° Billet Hose Fitting 4x Spring Clip Hose Clamps 1x Fitting Instruction Sheet Colour subject to availability. Show more