MISHIMOTO Subaru WRX STI Ignition Coil Set 2011-2021

A properly functioning engine relies on fuel, air, compression, and spark. Before increasing boost on your flat‑four, it is essential to ensure all maintenance is current and the ignition system is performing as intended. Weak spark delivery can cause misfires under high load, spark blowout at elevated boost levels, and overall reductions in performance and drivability. Mishimoto ignition coils are engineered as high‑quality replacements designed to restore the ignition system to optimal condition before pursuing further power‑adding modifications.

Each coil is designed and tested to meet or exceed OEM Subaru performance standards and is available individually or as a complete set of four. When installed alongside fresh spark plugs, these coils provide improved engine startup, smoother idle quality, and restored performance throughout the EJ powerband. The primary frame is constructed from robust phenolic resin to ensure long‑term durability in high‑temperature environments. A precision‑molded lower boot protects against moisture intrusion in the plug well, preventing contamination. Each coil is pre‑lubricated with dielectric grease to promote corrosion resistance and ensure a secure electrical connection between the coil and spark plug.

Mishimoto ignition coils are an ideal replacement for worn or failing factory units and deliver reliable performance for daily driving, spirited use, and modified EJ applications. As with all Mishimoto components, these ignition coils are backed by the Mishimoto Lifetime Warranty.