Mishimoto MMIG-WRX-0404 Ignition Coil 4-Pack for 2004-2010 Subaru WRX/STI EJ25

Vehicle Fitment

• 2004-2010 Subaru Impreza WRX STI (GD Chassis; EJ257 2.5L Turbo Flat-4; AWD)
• 2006-2010 Subaru Impreza WRX (GD/GE Chassis; EJ255 2.5L Turbo Flat-4; AWD)
• 2004-2010 Subaru Forester XT (SG/SH Chassis; EJ255 2.5L Turbo Flat-4; AWD)
• 2005-2009 Subaru Legacy GT (BP Chassis; EJ255 2.5L Turbo Flat-4; AWD)
• 2004-2010 Subaru Legacy (BL/BP Chassis; EJ253 2.5L Flat-4; AWD)
• 2004-2010 Subaru Outback (BL/BP Chassis; EJ253/EJ255 2.5L Flat-4; AWD)
• 2004-2010 Subaru Impreza (RS, TS, Outback Sport; GD/GE Chassis; EJ25 2.5L Flat-4; AWD)
• 2004 Subaru Baja Sport (BT Chassis; EJ255 2.5L Turbo Flat-4; AWD)

Fitment Notes

• Fits EJ20 and EJ25-series coil-on-plug engines across the 2004-2010 GD/GE/BL/BP/SG/SH Subaru platform
• Sold as a set of 4 ignition coils - one complete set for all four cylinders
• Mishimoto recommends installing new spark plugs at the same time for a complete ignition system refresh
• OEM Reference: 22433AA542, 22433AA580

Features

• Direct fit for 2004-2010 Subaru WRX STI and all compatible EJ25-platform models
• Designed and tested to meet or exceed OEM Subaru performance specifications
• Delivers a stronger, more consistent spark - critical for boosted EJ engines under high load
• High-quality phenolic resin outer shell provides long-term durability in high-temperature turbo engine environments
• Eliminates misfires, rough idle, hard starts, and power loss from worn or heat-damaged factory coils
• Suitable for stock and modified EJ25 applications including upgraded boost and tuned setups
• Easy bolt-on replacement requiring no modifications
• Backed by the Mishimoto Lifetime Warranty

Specifications

• Part Number: MMIG-WRX-0404
• Engine Codes: EJ20, EJ255, EJ257, EJ253 (coil-on-plug EJ-series)
• Outer Shell Material: High-Quality Phenolic Resin
• Quantity: Set of 4
• OEM Reference Numbers: 22433AA542, 22433AA580
• Installation Difficulty: Easy

Included Components

• 4x Mishimoto Ignition Coils (direct-fit for EJ20/EJ25 coil-on-plug engines)

Product Description

The Mishimoto MMIG-WRX-0404 is a direct-fit set of four ignition coils engineered for the coil-on-plug EJ20 and EJ25-family engines used across the 2004-2010 Subaru lineup. This covers the Impreza WRX STI, Impreza WRX, Forester XT, Legacy GT, Legacy, Outback, Impreza RS/TS/Outback Sport, and Baja Sport. The EJ's turbocharged variants are notorious for coil failure under high load and elevated heat - resulting in misfires, rough idle, and power loss that gets worse over time and is especially problematic at boost. This 4-pack addresses the issue at the root by replacing all four coils with units built to match or exceed OEM Subaru specifications.

Each coil features a phenolic resin outer shell engineered to withstand the demanding thermal environment of the EJ engine bay, and the kit is suitable for both stock and modified builds including tuned or higher-boost applications. Installation is a straightforward swap requiring no modifications, and pairing with fresh spark plugs is strongly recommended for a full ignition refresh. Backed by the Mishimoto Lifetime Warranty, this 4-pack is an essential maintenance and reliability upgrade for any EJ25 Subaru owner.