NGK Iridium IX Spark Plug Box of 4 (XR4IX)

When you're looking to get the most out of your engine, especially in modified or high-performance applications, upgrading your spark plugs is a smart move. These NGK Iridium IX spark plugs are built to handle the demands of engines that need a strong, consistent spark. They are designed to offer improved acceleration and better fuel efficiency compared to standard plugs, making them a popular choice for enthusiasts looking for that extra edge.

What sets these NGK plugs apart is their fine iridium tip. Iridium is a very hard metal, six times more durable than platinum, and it has a very high melting point. This means the spark plug can withstand the higher temperatures and pressures found in performance engines while maintaining a sharp, focused spark. The tapered cut on the ground electrode also helps with easier starting, smoother idling, and a more responsive throttle. Plus, the trivalent metal plating on the plug body helps resist corrosion and makes them easier to remove later on.

This set comes with four spark plugs, which is what many common V6 and V8 engines require. They are a direct upgrade from OE nickel alloy plugs and are well-suited for today's high-temperature engines. If you're working on a classic muscle car or a modern performance vehicle, these NGK plugs can help ensure your ignition system is firing on all cylinders.