NGK BKR6EIX / 6418 Iridium IX Spark Plug Replaces FR7DPP22U OE179 RC8WYP4 K20PSR-B8 (6418 ) Designed specifically for the performance enthusiast, Iridium IX offers extreme ignitability, enhanced throttle response & superior anti-fouling. Fine iridium tip ensures high durability & a consistently stable spark Iridium alloy has extremely high melting point, perfect for todays high-tech, high-performance engines Trivalent metal plating provides superior anti-corrosion & anti-seizing properties Outstanding acceleration, high fuel efficiency & durability Ultimate design, technology & performance BOX DIMENSIONSHeight (mm): 85 Width (mm): 24 Length (mm): 22 If you are unsure as to whether this is the correct part for your vehicle, please don't hesitate to contact us. Alternatively please use the cross reference table above.