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 including, but not limited to, the following (Note: engine affects fitment - verify specific fitment details with amazon confirmed fit fit checker above): BUICK: 02-05 Century, 05-09 LaCrosse, 96-05 LeSabre, 06-08 Lucerne Compatible with (cont): BUICK: 95-05 Park Avenue, 96-04 Regal, 02-07 Rendezvous; CHEVROLET: 96-05 Astro, 96-05 Blazer, 96-02 C1500, 96-99 C1500/2500 Suburban, 96-00 C2500/3500, 95-02 Camaro, 05-09 Equinox, 96-14 Express 1500, 96-06 Express 2500/3500 Compatible with (cont): CHEVROLET: 00-05 Impala, 96-99 K1500/1500 Suburban, 96-00 K2500/3500, 96-99 K2500 Suburban, 02-06 Malibu, 98-05 Monte Carlo, 96-99 P30, 96-04 S10, 99-13 Silverado 1500, 96-99 Suburban 1500, 96-00 Tahoe, 05-06 Uplander Compatible with (cont): CHEVROLET: 02-05 Venture; GMC: 96-99 C1500/1500 Suburban, 96-00 C2500/3500, 96-99 C2500 Suburban, 96-05 Jimmy, 96-99 K1500/1500 Suburban, 96-00 K2500/3500, 96-99 K2500 Suburban, 96-99 P3500, 96-05 Safari, 96-14 Savana 1500 Compatible with (cont): GMC: 96-06 Savana 2500, 96-02 Savana 3500, 99-13 Sierra 1500, 96-04 Sonoma, 96-00 Yukon; PONTIAC: 02-05 Aztek, 95-05 Bonneville, 95-02 Firebird, 05-06 G6, 02-05 Grand Am, 97-08 Grand Prix, 02-06 Montana; SATURN: 05-06 Relay