Description
The Mishimoto MMIG-STI-1104 is a coil-on-plug (COP) ignition coil built specifically for Subaru’s 2.5L turbocharged flat-four engines, using a phenolic resin outer shell and a precision lower boot pre-lubricated with dielectric grease to guard against moisture and corrosion. Offered as a single coil or as a full set of four, this Mishimoto ignition coil is designed and tested to meet or exceed OEM Subaru performance specifications for the EJ255 and EJ257 engine codes.
Weak spark from a tired factory ignition coil can cause misfiring under load and spark blow-out under boost, both of which hurt performance before you even think about power upgrades. This Mishimoto ignition coil is meant as a Stage 0 refresh item: paired with a fresh set of spark plugs, it restores strong, consistent spark for improved engine startup, a smoother idle, and restored performance on stock or modified EJ-powered Subarus. As part of Mishimoto’s growing lineup of ignition parts, it’s engineered as a direct, high-quality replacement for worn or defective factory coils rather than a universal fit unit.
Vehicle Applications
This ignition coil is built around Subaru’s EJ255 and EJ257 engine codes and covers a wide span of Subaru Forester, Impreza, WRX, and Legacy GT applications. On the Forester side, it fits the XT Limited (2010, 2012–2013), XT Premium (2010–2013), XT Sports (2010–2012), and XT Touring (2011–2013). Within the Impreza lineup, the 2.5 GT, WRX GT, WRX SE, and WRX STI Special Edition are covered for the 2010 model year, while the WRX, WRX Limited, WRX Premium, and WRX STI are covered from 2010 through 2014, and the WRX STI Limited from 2011 through 2014. Legacy coverage includes the 2.5GT and 2.5GT Limited (2010–2012), the 2.5GT Premium (2010 only), and the Legacy GT (2010–2013). Later WRX and WRX STI applications include the WRX Base (2012–2014), WRX Limited (2013–2014), WRX SE (2014), WRX STI (2012–2016), WRX STI Base (2013–2021), WRX STI Limited (2015–2021), WRX STI Sport (2017–2021), and WRX STI Sport-tech (2013–2014 and 2017–2021), plus the specific-edition WRX STI Launch Edition (2015), Series.HyperBlue (2016), Tsurugi Edition (2014), Type RA (2018), S209 (2019), Kanrai Edition (2020), and STI trim (2018–2021).
Features
- High-quality replacement coils available as a single coil or complete set of four
- Designed and tested to meet or exceed OEM Subaru performance specifications
- Improves engine startup, idle, and restores ignition performance
- Refreshes the ignition system with strong spark for stock and modified vehicles
- Durable rubber lower boot provides a barrier against moisture, oil, and debris
- Phenolic resin outer shell helps ensure longevity in high-temperature environments
- Pre-lubricated boot with dielectric grease supports corrosion resistance
- Backed by the Mishimoto Lifetime Warranty
Specifications
- Brand: Mishimoto
- Part Number: MMIG-STI-1104
- Length: 4.31 in
- Overall Height: 3.07 in
- Color: Black
- Terminal Type: Blade
- Connector Gender: Female
- Terminal Gender: Female
- Ignition Type: Electronic
- Coil Type: COP Coil
- Coil Wire Included: No
- Oil Filled: No
- Universal or Specific Fit: Specific
- Grade Type: Standard Replacement
- Engine Codes: EJ255, EJ257
- Available As: Single Coil or Set of 4
Frequently Asked Questions
Is the Mishimoto MMIG-STI-1104 sold as a single coil or a full set?
It is available in two options: a single Subaru H4 ignition coil, or a set of four Subaru H4 ignition coils, both backed by the Mishimoto Lifetime Warranty.
What engine codes does this ignition coil fit?
This coil is built for Subaru engines with the EJ255 and EJ257 engine codes.
Does this coil include a coil wire or come oil filled?
No, this coil does not include a coil wire and is not oil filled.
What is the coil housing made from?
The primary frame is constructed from phenolic resin, chosen for durability in high-temperature environments.
How does this coil help prevent moisture and corrosion issues?
The precision lower boot creates a barrier against moisture entry into the plug well, and the coil is pre-lubricated with dielectric grease to prevent corrosion and ensure an optimal connection between the spark plug and coil.
What warranty comes with this Mishimoto ignition coil?
It includes Mishimoto’s signature Lifetime Warranty.
âš WARNING (California Proposition 65): This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
