These NGK Spark Plugs (6509) are designed specifically for the performance enthusiast, so they are perfect for your modified 2013-2018 Focus ST or 2016-2018 Focus RS. Iridium alloy is used in these plugs, providing an extremely high melting point for your 2013-2018 Focus ST or 2016-2018 Focus RS.
Features and Benefits:
- Fine Iridium Tip Has High Durability and a Consistently Stable Spark
- Extremely High Melting Point
- Trivalent Metal Plating
- Superior Anti-Corrosion and Anti-Seizing Properties
- Outstanding Acceleration, High Fuel Efficiency and Durability
- Ultimate Design, Technology and Performance
- OE Heat Range
This set of four Iridium IX Spark Plugs from NGK Spark Plugs fits all ST and RS Focuses, and is a perfect replacement spark plug. These plugs have superior anti-corrosion properties and a higher melting point than the original stock plugs do. These spark plugs offer extreme ignitability, improved throttle response and superior anti-fouling, all great and welcome benefits for improving the function of your Focus's engine and all-around performance!
NGK Spark Plugs is known for their numerous contributions to the spark plug market, including the development of copper core spark plugs, new ceramic technology and the development of iridium spark plugs like these. NGK Spark Plugs also developed the V-Groove spark plug, which is an ideal product for today's clean-burning, low emissions engines.