Ignition Coil and Iridium Spark Plugs for Subaru Forester (2017-2018) 2.0L

High-Conductivity Ignition Coil and Iridium Spark Plug Service Kit for 2017-2018 Subaru Forester

Direct-Fit Ignition Overhaul: Restores factory spark energy and stabilizes high-boost combustion efficiency across the entire RPM band on turbocharged FA20 powerplants.

The Stock Forester Thermal Breakdown

Due to the horizontal layout of the Boxer engine, the factory coil-on-plug boots and primary windings endure continuous thermal radiation directly off the exhaust headers and cylinder heads. Over time, prolonged heat soak degrades the internal insulation and primary copper windings, inducing micro-arcing, dielectric failure, and increased internal resistance. On turbocharged 2.0L configurations, this thermal fatigue manifests as high-load spark blowout, hesitation during boost ramp-up, sluggish throttle response, and erratic idle.

The Engineering Solution

This comprehensive ignition service kit eliminates secondary voltage leaks through heavy-duty dielectric silicone boots and high-density epoxy potting. The coil packs feature high-purity electrolytic copper windings engineered to deliver stable, high-voltage discharge under elevated cylinder pressures. Paired with fine-wire iridium spark plugs, this system lowers required ionization voltage, promotes rapid flame kernel expansion, and resists carbon fouling under severe duty cycles.

Technical Specifications

Compatibility

• 2017 Subaru Forester 2.0XT Premium (2.0L H4 Turbo - FA20DIT)
• 2017 Subaru Forester 2.0XT Touring (2.0L H4 Turbo - FA20DIT)
• 2018 Subaru Forester 2.0XT Premium (2.0L H4 Turbo - FA20DIT)
• 2018 Subaru Forester 2.0XT Touring (2.0L H4 Turbo - FA20DIT)

The Subaru Performance Caliber

Engineered to withstand the demanding cylinder pressures of the turbocharged Boxer platform, this ignition kit delivers reliable spark continuity, smooth boost transitions, and factory-correct electrical impedance with no CEL trigger.