NGK Iridium Spark Plugs Heat Range #7

These NGK Iridium spark plugs are designed for Focus RS, offering improved durability and heat resistance. They are one step colder than stock and recommended for heavily modified vehicles.

• The description claims that iridium plugs can use larger gap settings with less voltage.
• The description recommends using one step colder plugs for cars with significant modifications.
• The description suggests that regapping the plugs may be necessary but warns against using a slide-type plug gapper.