NGK IX Iridium Series plugs were designed specifically for the performance enthusiast. Good to use in your 1ZZ, 2ZZ, or 2AR engine! Fine wire center electrode ensures high durability and a consistently stable spark. Iridium alloy has an extremely high melting point, perfect for today's high-tech, high performance engines.

• Trivalent metal plating provides superior anti-corrosion and anti-seizing properties
• Corrugated ribs prevent flashover
• Pure alumina silicate ceramic insulator, provides superior strength and better heat transfer
• Copper core aids in heat removal
• Triple seals prevent leakage
• '6' Heat Range

This set includes:

• NGK Iridium Spark Plug x 4

Q: What does the heat range number indicate?

A: Typically the heat range for NGK Spark Plugs varies from 2-11. This number indicates the thermal characteristics of a spark plug, or how 'hot' or 'cold' a spark plug is. The term hot/cold is commonly used to describe whether a spark plug heats up easily (hot) or whether it provides resistance to heating up (cold).

Torque Specs

• Cast Iron: 18-25.3 lb. ft.
• Aluminum: 18-21.6 lb. ft. 

• Sample product image shown.