•  Iridium-tipped spark plugs have been adopted on both trailing and leading sides to improve durability.

•  A center electrode with a thick insulator and extremely thin tip (diameter of 0.8 mm {0.03 in}) and small single-ground electrode have been adopted to stabilize firing under a thin fuel-air mixture. At the same time, high-heat resistance has been improved by decreasing the temperature of the electrode and the insulator.

•  Spark plugs with an internal resister have been adopted to remove noise caused by the ignition system. The effect of which prevents ignition noise from mixing with the audio system.

•   To prevent mis-installation, a paint mark is applied to the upper surface of the spark plug terminal as shown in the table: