NGK 6510 1-step Colder Iridium Spark Plugs - Mazdaspeed / Focus RS/ST / Ecoboost Mustang - Set of 4

NGK Iridium IX Spark Plugs LTR7IX-11 are designed specifically for the performance enthusiast. Iridium IX offers extreme ignitability, improved throttle response and superior anti fouling.

The 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.

These are one step colder plugs and are recommended for higher horsepower applications. A higher heat range number does not improve engine performance, it increases the plugs ability to dissipate heat.

Stock Number 2309
Heat Range: 7

NOTE: For stock turbo Mazdaspeed applications we recommend these to be gapped from .026-.028. For applications over 500hp we recommend a .024-.026 gap.

Perfect plug for the following:

Ford Focus ST
Ford Focus RS
Ford Mustang Ecoboost
Ford Fiesta ST
Mazdaspeed 3
Mazdaspeed 6
Ford Mustang GT (Order QTY 2 for 8 plugs total)