SET OF 6 PERFORMANCE SPARK PLUG Mercury 300HP Verado (all) * GTZ140EOR15LGSXV121 1. Higher HP and torque by up to 3 % 2. increased economy by up to 5% 3. 360 Firing Technology 4. Improved acceleration by up to 15 % 5. 5 UP TO 600 HOUR LIFESPAN