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Ngk 4421 V-Power Spark Plug - BKR4E luggage-fender-bags-storage 2008 Harley Davidson FLHX StreetSpark Plug Code: BKR4E Lowers ignition system voltage requirements. Greater ignitability and performance over conventional spark plugs. Trivalent Metal Plating has superior anti corrosion and anti seizing properties. Increased fuel economy and lower emissions. Highly durable against electrical and chemical wear. Good performance spark plug.