NGK LFR5AGP 5018 Platinum Spark Plugs (Set of 16) for 2009+ 5.7L 6.4L HEMINGK G Power Series offers the performance and durability of platinum at a competitive price. Fine wire platinum tipped center electrode reduces required voltage for better starts, superior acceleration and increased fuel economy. Trapezoid cut ground electrode reduces quenching Trivalent metal plating provides superior anti corrosion and anti seizing properties Corrugated ribs prevent flashover Pure alumina silicate ceramic insulator, provides