Best Spark Plugs

18%

Fused iridium and platinum center electrode, sintered into an extended insulator nose results in reaching self-cleaning temperature only seconds after starting and provides exceptional wear resistance
Revolutionary surface air gap firing technology featuring Bosch's unique four ground electrode design delivers the most powerful spark for the most efficient combustion and optimum horsepower without increasing the voltage requirement
Four yttrium enhanced ground electrodes resist spark plug wear and oxidation for exceptional performance life
Factory pre-set gap allows for easy installation of this HGR9DQI that never requires adjustment
Fusion's voltage requirement increases less over time versus other iridium plugs for longer reliable performance of the vehicle's ignition system

Copper-glass seal bonds insulator, terminal post, and center electrode together to provide a tight seal that is 100 percent leak-proof
Cold-formed steel shell and precision rolled threads, with one-piece terminal post to add strength
Multi-rib insulator reduces danger of "flash-over"
Resistor reduces radio frequency interference (RFI) and electrode erosion
Full copper core electrode provides better performance in all conditions

27%

Designed to operate over a much wider heat range than ordinary plugs
Resists carbon buildup and pre-ignition
High alumina ceramics for better heat transfer and electrical insulation
Solid copper core and nickel tipped electrode provide a longer plus life
Patented triple gasket sealing process eliminates the possibility of combustion gas leakage

Twin-tip technology with 11 mm platinum center electrode and 11 mm titanium enhanced ground electrode
Improve fuel economy, better acceleration and faster starts than all other single platinum plugs
Purified alumina powder insulator provides exceptional dielectric strength and thermal conductivity, allowing the material to stand up to extreme stress
Purified alumina powder insulator provides exceptional dielectric strength and thermal conductivity, allowing the material to stand up to extreme stress

Latest technology laser multi-spark plug, 14mm thread, 18mm (.708") reach, tapered seat, 5/8" hex
Designed to replace factory installed spark plugs in auto, motorcycle, ATV and marine applications
Ability to fire multiple sparks with standard factory ignition system
Fire in 360degree at place of best air/fuel mixture-spark not confined in one predetermined location
Better utilization of available combustion energy - better performance and fuel utilization

Platinum firing pin and yttrium enhanced ground electrode provide 2X longer service life compared to standard copper plugs
Fine wire design provides better ignitability and performance
360° continuous laser welding to fuse the platinum firing pin for increased durability
4 year performance satisfaction guarantee
Original equipment, pre-gapped replacement delivering optimum fit, form and function

63%

Full platinum tips ensure virtually no gap erosion
Works to optimize engine performance for a longer life and improved fuel economy
Necked-down center electrode fires quicker and cleaner, with less voltage for easier starts and quicker acceleration
High nickel alloy side electrode maintains precise gap
Full copper core electrode provides better performance in all conditions

Designed specifically for the performance enthusiast, Iridium IX offers extreme ignitability, improved throttle response and superior anti-fouling
The 0.6mm laser welded fine Iridium tip ensures high durability and a consistently stable spark and the tapered ground electrode minimizes electrical quenching effect
Longer insulator nose prevents fouling, the corrugated ribs on insulator prevents flashover, and a triple gasket seal eliminates combustion gas leakage. Copper core aids in heat removal
Iridium alloy has extremely high melting point, giving it high durability to heat and electrical wear, perfect for today's high-performance engines
Trivalent metal plating has superior anti-corrosion and anti-seizing properties

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