Ignition Coil + Spark Plugs for Subaru WRX (2006-2007) 2.5L

Direct-Replacement Ignition Coil and Denso Spark Plug Kit for 2006-2007 Subaru WRX (GD)

What it Does: The complete ignition kit replaces degraded factory coil packs and worn plugs on the 2006-2007 Subaru WRX to eliminate high-rpm spark blowout and restore stable combustion under boost.

The Stock Subaru WRX Thermal Degradation Problem

The horizontally opposed layout of the EJ255 places coil-on-plug packs in cramped lateral positions directly adjacent to the exhaust runners and turbo downpipe. Constant thermal cycling in the GD engine bay hardens factory silicone boots, deteriorates internal copper windings, and causes dielectric potting resin to micro-fracture. This degradation leads to secondary voltage arcing, intermittent cylinder misfires (P0301–P0304 codes), stumbling under wide-open throttle, and unburnt fuel fouling the catalytic converter.

The Engineering Solution

This refresh package restores complete ignition integrity with high-temp composite coil housings and genuine Denso Iridium spark plugs. Built to meet or exceed UF508 benchmarks, each coil features reinforced magnetic laminations and high-dielectric epoxy insulation engineered to withstand continuous turbo heat soak. Paired with fine-wire Denso iridium electrodes that demand lower firing voltage while offering superior thermal conductivity, this package delivers a concentrated, reliable spark kernel capable of igniting rich, pressurized air-fuel charges without quench.

What's Included

• 4 Ignition Coils replacement for UF508
• 4 Denso Iridium Spark Plugs

Technical Specifications

Compatibility

• 2006-2007 Subaru WRX 2.5L turbo
• 2006-2007 Subaru WRX Limited 2.5L turbo
• 2006-2007 Subaru WRX TR 2.5L turbo

Frequently Asked Questions & Fitment Warnings

Does this fit the GD WRX?

Yes, this is a direct fit for the 2006-2007 Subaru WRX equipped with the EJ255 2.5L turbocharged engine. It is not compatible with naturally aspirated 2.5L models or non-specified model years.

Are spark plug wires required to complete installation?

No, the 2006-2007 WRX utilizes a direct coil-on-plug configuration where each coil pack seats directly atop its respective spark plug without external HT leads.

The Subaru Performance Caliber

Maintaining solid ignition primary and secondary circuits is vital to preserving boxer engine reliability, consistent boost delivery, and crisp throttle response across the entire rev range.