Designed specifically for the performance enthusiast. Iridium IX® offers extreme ignitability, improved throttle response and superior anti fouling

Perfect for nitrous and force induction engines
Fine Iridium tip ensures high durability and a consistently stable spark
Iridium alloy has extremely high melting point, perfect for today’s high-tech, high-performance engines
Trivalent Metal Plating - superior anti-corrosion and anti-seizing properties
Outstanding acceleration, high fuel efficiency and durability
Ultimate design, technology and performance.
One Step Colder Spark Plugs for 2.3L Ecoboost Mustang, 2.3L Bronco, 2011-2023 Mustang 5.0L,

Orders placed before 10:00 AM (EST) are typically processed the same business day. Orders placed after 10:00 AM will be processed the following business day.

Please allow extra time during promotions or new product launches, as order volume may be higher than usual.

All Race Factory orders are carefully hand-picked, packed, and shipped from our U.S. facility.

Returns are handled on a case-by-case basis and must be approved before any item is sent back. Please contact us to request a return authorization.

• Items must be unused, in original condition, and in the original packaging.
• Electrical components and sensors are non-returnable once installed or opened.
• Customers are responsible for all return shipping costs. We recommend using a trackable shipping method.
• All sale and clearance items are final sale and cannot be returned or exchanged.