Upgrade your ignition system with the Mishimoto Ignition Coil Set MMIG-FOST-1204, designed to enhance the performance of your 2015+ Ford Mustang EcoBoost and 2012-2018 Ford Focus ST. Weak spark can lead to misfiring and poor performance, especially under high load or boost conditions. This set of four ignition coils is engineered to deliver reliable ignition and is perfect for those looking to maintain their vehicle*s performance before adding more horsepower modifications. Constructed from durable phenolic resin, these ignition coils are built to withstand high temperatures while ensuring longevity. The precision lower boot prevents moisture from entering the plug well, protecting against spark plug contamination. Additionally, each coil is pre-lubricated with dielectric grease to prevent corrosion and ensure a strong connection between the spark plug and coil. With the Mishimoto Ignition Coil Set, you can expect improved engine startup, smoother idling, and restored performance for your EcoBoost engine. Plus, enjoy peace of mind with Mishimoto's signature Lifetime Warranty. <b>Features:</b> * Durable phenolic resin construction for optimal longevity in high temperatures: Durable phenolic resin construction for optimal longevity in high temperatures * Precision lower boot design prevents moisture entry, protecting spark plugs: Precision lower boot design prevents moisture entry, protecting spark plugs * Pre-lubricated with dielectric grease to ensure a quality connection: Pre-lubricated with dielectric grease to ensure a quality connection