NGK 2667 Spark Plug BKR7EIX Iridium IX – 4 Pack

Efficient Ignition for Modern Engines

Designed for today’s high-tech engines, the NGK 2667 BKR7EIX Iridium IX spark plugs come in a convenient 4-pack. This combination targets enthusiasts and everyday drivers who want reliable ignition, smooth idling, and responsive acceleration across a broad range of popular vehicles, including several Audi, Buick, Chevy, and VW models. The goal is steadier starts, cleaner burns, and practical maintenance intervals, without promising guarantees—results vary with vehicle condition and driving style.

The Iridium IX line uses a fine-wire iridium center electrode to help deliver durable, consistently stable sparks at elevated engine temperatures. The plugs also feature a trivalent metal plating that resists corrosion and seizing, along with corrugated ribs that help prevent misfires caused by flashover. An iridium alloy with a high melting point contributes to durability under heat and electrical wear, while the pure alumina silicate ceramic insulator provides solid strength and effective heat transfer. A solid copper core further aids in heat removal, supporting reliable combustion across a wide range of operating conditions.

What this means for your vehicle

With this NGK Iridium IX set, you may notice steadier throttle response, more consistent ignition under load, and improved performance consistency during daily driving or spirited sessions. The design emphasizes longevity and resistance to the stresses of modern fuel systems and high-compression engines, offering a practical upgrade path for compatible vehicles without overpromising outcomes.

Key features at a glance

• IX Iridium Series spark plugs are designed for reliable ignition and maximum efficiency in modern engines.
• Trivalent metal plating enhances corrosion resistance and seizing protection; corrugated ribs help prevent flashover.
• Fine-wire iridium center electrode delivers durable, stable sparks at high temperatures.
• Iridium alloy provides high heat and electrical wear resistance for long-lasting performance.
• Pure alumina silicate ceramic insulator plus a solid copper core improve strength and heat transfer.

Product specs and installation notes

• Thread diameter: 14 mm
• Thread pitch: 1.25 mm
• Seat type: Gasket
• Reach: 19 mm (3/4")
• Hex size: 5/8" (16 mm)
• Center electrode material: Iridium; size 0.6 mm; projected tip
• Ground electrode: Nickel; standard shape; resistor: yes; resistor value: 5 kΩ
• Heat range: 7

Torque guidance varies by engine block material. Cast iron engines typically call for 18–25.3 lb ft, while aluminum blocks may use 18–21.6 lb ft. The nominal gap is 0.8 mm, and the overall height is ISO-compliant for broad compatibility.

What’s in the box

The 4-pack provides a ready-to-install set designed for convenient maintenance and consistent replacement intervals across compatible model years and trims. Use as part of a regular tune-up routine to help maintain crisp starting and steady performance.