NGK SILFR6A 7913 Iridium Spark Plugs 4 Pack sku-511413479

NGK SILFR6A Engine & Powertrain Replacement Parts listing sku-511413479 is a 4 pack of Laser Iridium 7913 spark plugs. The plugs replace Subaru 22401AA670 and DENSO IKH20TT, 4704, PKH20TT and 4506 parts. Their shell resists corrosion, while the center and ground electrodes support spark focus, combustion and fewer misfires.

The description states that the plugs reduce emissions, improve fuel economy and limit spark gap growth. NGK dates its product line to 1936 and works with auto manufacturers on spark plugs and oxygen sensors; the source describes NGK as a leading supplier whose components are used by Honda, Toyota, Mazda, Nissan, GM, Ford and Chrysler.