Bosch Double Iridium Spark Plugs feature both an iridium firing pin and an iridium ground electrode inlay that offer higher performance and 4X longer life compared to standard copper spark plugs 360-degree laser welded ultra-fine wire iridium firing pin provides better ignitability - reducing voltage requirements up to 24% - and enhanced durability Nickel-plated rolled threads provide superior resistance to corrosion and do not require anti-seize - making installation quick and easy Bosch Double Iridium spark plugs are pre-gapped at the factory and ready to install right out of the box - gap adjustment prior to installation not required Meets or exceeds manufacturer design requirements for OE fit, form, and function for modern gasoline engines - including Gasoline Direct Injection (GDI) engines Compatible with select vehicles (Note: engine affects fitment - verify specific fitment details with amazon confirmed fit fit checker above): FORD: 1996-05,2007-11 Crown Victoria, 2014 E-150, 2003-04 E-250, 2014 E-250, 1997-02 E-250 Econoline Compatible with (continued): FORD: 2003-04 E-350 Club Wagon, 1997-98 E-350 Econoline, 1997-02 E-350 Econoline Club Wagon, 1999-04 E-350 Super Duty, 1999 Econoline Super Duty, 2002 Expedition, 2000-03 F-150, 2004 F-150 Heritage Compatible with (continued): FORD: 1997-99 F-250, 2005-06 GT, 2003-04,2007-12 Mustang, 2001-10 Ranger; LINCOLN: 2006-11 Town Car; MERCURY: 2006-11 Grand Marquis