These plugs are 1 step colder than OEM and are perfect for those pushing the limits — whether you’re running a big turbo setup or maxing out your stock turbo. Designed for performance and reliability under high boost, these plugs come pre-gapped to our EMS spec and are ready to install right out of the box.
Just pull them out, drop them in, and get back to boosting.
Available in a sets of (4) plugs to support 4-cylinder EcoBoost platforms.
THE RR12S Spark Plugs DO NOT FIT THE S650 ECOBOOST MUSTANG











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