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That part number (M-12405-35T) is slotted for the 3.5 Ecoboost V6 motors- only sold in sets of 6. The Ford Performance plugs that are specked for the 2018 2.3 Focus RS and Mustang 2.3 Ecoboost are M-12405-20T, said to be 2 steps colder than stock. Any reason you chose the plugs for the V6...