With its yttrium-enhanced ground electrode this spark plugs is on the must have list for any engine developing higher than stock levels horsepower.
Bosch motorports spark plugs put less stress on the ignition system for quicker starts, more efficient fuel combustion, and a longer performance life. In addition, voltage requirement increases less over time versus other iridium plugs for longer reliable performance of the vehicle's ignition system.
One step colder than OE plugs for increased resistance to overheating and melt down.
Sold as single unit.