Ignition Coil and Iridium Spark Plugs for Subaru Legacy (2005-2009) 3.0L

Direct-Fit Ignition Coil and Iridium Spark Plug Kit for 2005-2009 Subaru Legacy 3.0L

What it Does: Restores factory combustion efficiency and eliminates cylinder misfires under load with direct-fit coil-on-plug modules and pre-gapped iridium plugs.

The Stock Legacy Thermal Breakdown and Spark Degradation

The horizontally opposed EZ30 3.0L boxer engine houses its ignition components low in the chassis, placing coil packs in direct proximity to exhaust heat radiation within cramped cylinder head pockets. Over time, severe thermal cycling degrades the factory epoxy potting and hardens silicone insulation boots, creating micro-arcing, carbon tracking, and high-load spark blowout that dulls throttle response and triggers misfire codes.

The Engineering Solution

This comprehensive overhaul kit features six reinforced coil packs engineered with high-temp magnetic copper windings and robust dielectric resin to prevent internal shorting under sustained thermal load. Paired with fine-wire iridium core spark plugs (ILFR6B spec), this setup provides lower ignition voltage requirements, a concentrated spark kernel for complete flame propagation, and rugged high-grade silicone boots that isolate secondary voltage completely.

Technical Specifications

Compatibility

• 2005-2009 Subaru Legacy 3.0L H6 (Sedan & Wagon)
• Interchange: UF287, UF-287, 22433-AA441, 22433AA441, 22433-AA411, 22433AA411, 22433-AA530, 22433AA530, ILFR6B, ILF6RB

The Subaru Boxer Standard

Designed specifically to handle the high heat and lateral packaging demands of Subaru boxer engines, this kit ensures stable idle, seamless high-RPM power delivery, and factory ECU dwell compliance with zero CEL triggers.