NGK Iridium IX Spark Plug Box of 4 (TR65IX)

The fine iridium center electrode on these NGK Iridium IX spark plugs is six times harder than platinum, offering exceptional durability and a consistent spark. This makes them a great choice for upgrading your engine's ignition system, especially if you're looking for improved acceleration and better fuel efficiency. They're designed to handle the higher temperatures found in many modern engines, providing reliable performance.

NGK uses a tapered cut ground electrode which helps with easier starting, smoother idling, and a more responsive throttle. The iridium alloy has a very high melting point, which is ideal for today's engines. These plugs also feature trivalent metal plating, which helps prevent corrosion and seizing, making them easier to remove down the road. They come in a box of four, ready to replace the standard plugs in a wide range of vehicles like the Ford Focus, Mazda 3, or Aston Martin Vanquish.