NGK Single Iridium Spark Plug Box of 4 (TR8IX)

When you're looking to get the most out of your engine, especially if it's been modified or you're aiming for higher performance, upgrading your spark plugs is a smart move. These NGK Iridium IX spark plugs are built with a fine iridium center electrode, which is significantly more durable than platinum. This means you get a consistent, strong spark over a longer period, helping your engine run smoother and more efficiently.

The iridium alloy has a very high melting point, making it well-suited for today's hotter-running engines. You can expect improved acceleration and better fuel efficiency from these plugs. They also feature trivalent metal plating, which helps prevent corrosion and seizing, making them easier to remove next time around. The tapered ground electrode design further aids in starting and idling, contributing to a more responsive feel.

These are a great option if you're replacing standard nickel alloy plugs or looking for an upgrade for your performance application. Just remember that for some applications, like certain Mercury models, these are a colder heat range than stock, so confirm compatibility for your specific setup.