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Iridium tip promotes the best spark and increases plug resilience for longer life
Proprietary ceramic insulator enhances dielectric strength for reliable ignition
Yttrium-coated copper core handles high heat from high horsepower engines
Machined electrode design improves comprehensive drivability and economy
Extended reach and 1 mm tip for optimal spark placement
Summarized by Shop
MSD iridium spark plugs will fire up your engine for optimum performance. These plugs have been engineered from the inside out for efficient combustion to create the most power possible for your setup. MSD's proprietary design features center tips made from iridium--a super hard material that promotes the best spark as well as increased r