Ignition Coil and Iridium Spark Plugs for Subaru WRX (2015-2021) 2.0L

Direct Replacement Ignition Coil and Iridium Spark Plugs for 2015-2021 Subaru WRX

Restores optimal combustion efficiency and eliminates high-boost misfires by replacing degraded factory ignition components.

The Stock WRX Ignition Weakness

The factory ignition coils and spark plugs on the FA20F (FA20DIT) engine are prone to premature wear, especially as thermal stress accumulates over thousands of heat cycles. Under continuous boost pressure, the OEM components begin to experience degraded spark energy, leading to part-throttle hesitation, rough idling, and catastrophic cylinder misfires under load. Furthermore, the intense cylinder pressures generated by the factory twin-scroll turbocharger easily blow out weakened sparks. This forces the ECU to pull ignition timing, which severely degrades engine response, drops torque output, and negatively impacts overall fuel economy.

The Engineering Solution

This kit combines high-voltage ignition coils with ultra-fine wire iridium spark plugs designed specifically for the extreme conditions of the 2.0L turbocharged flat-four. The coils feature upgraded internal copper windings and high-temperature epoxy potting to prevent electrical arcing and heat degradation, ensuring consistent primary-to-secondary voltage transfer. Paired with iridium spark plugs—featuring exceptionally high melting points and superior electrical conductivity—this tune-up package guarantees a concentrated, powerful spark capable of igniting dense air-fuel mixtures without blowout. The result is restored timing curves, smoothed power delivery across the entire RPM range, and optimal fuel burn under full boost.

Technical Specifications

Compatibility

• 2015 Subaru WRX 2.0L Turbo
• 2016 Subaru WRX 2.0L Turbo
• 2017 Subaru WRX 2.0L Turbo
• 2018 Subaru WRX 2.0L Turbo
• 2019 Subaru WRX 2.0L Turbo
• 2020 Subaru WRX 2.0L Turbo
• 2021 Subaru WRX 2.0L Turbo

The Subaru Performance Caliber

Built to handle the rigorous demands of turbocharged flat-four architectures, this ignition upgrade restores factory power delivery, improves throttle response, and ensures reliable drivability across all boost levels.