4 PCS NEW -- NGK 3403 G-Power Platinum Alloy Spark Plug TR55GP Platinum alloy ground and center electrode provide greater spark Superior performance with better fuel efficiency, lower emissions, and quicker starts Require voltage reduced by 0.6mm laser welded fine platinum tip Insulator noses have special configurations that improve throttle response and prevent fouling with corrugated ribs, which prevents flashover Trivalent metal plating