NGK 95605 1-step Colder Ruthenium HX Spark Plug’s - Mazdaspeed / Focus RS/ST / Ecoboost Mustang Set of 4

NGK Ruthenium HX High Ignitability spark plugs are the best in class plug for todays modern vehicles. Patented Ruthenium technology offers the most advance tip technology and delivers the highest performance and life expectancy. Created from advanced OE technology as a high ignitability plug; Ruthenium HX spark plugs come with patented, specialized OEM DFE and PSPE tip designs. NGK Ruthenium HX High Ignitability spark plugs provide a more complete fuel burn resulting in a quicker throttle response, smoother idle and better cold starts. Ruthenium center electrode provides industry leading durability.

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 95605
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.