Best Iridium Spark Plugs of 2026

The NGK Iridium IX Spark Plug is designed for performance enthusiasts, offering improved throttle response, anti-fouling, and extreme ignitability. The spark plug features a 0.6mm laser-welded fine iridium tip that ensures high durability and consistent, stable sparks. A tapered ground electrode helps minimize the electrical quenching effect, while a longer insulator nose prevents fouling. The spark plug also has superior anti-corrosion and anti-seizing properties thanks to its trivalent metal plating.

The NGK LKR7DIX-11S Iridium IX Spark Plug is designed for performance enthusiasts, offering extreme ignitability and improved throttle response. Its laser-welded fine Iridium tip ensures high durability and a consistently stable spark, while the tapered ground electrode minimizes electrical quenching effect. The corrugated ribs on the longer insulator prevent flashover, and the triple gasket seal eliminates combustion gas leakage. The Iridium alloy has an extremely high melting point, making it durable to heat and electrical wear, perfect for high-performance engines. The Trivalent Metal Plating provides superior anti-corrosion and anti-seizing properties.

NGK 6619 Iridium Spark Plugs are designed to operate over a wider heat range than ordinary plugs, resist carbon buildup and pre-ignition, and eliminate the possibility of combustion gas leakage with its patented triple gasket sealing process. These spark plugs are ideal for anyone who wants a durable and reliable option for their vehicle.

The NGK Iridium IX Spark Plugs offer advanced technology designed to improve your Harley Davidson Twin Cam's performance. They arrive pre-gapped, so you save time and get the perfect fit right out of the box. The ultra-small center electrode lowers the voltage needed to ignite the spark, which helps your ignition system last longer and work more efficiently. Plus, the new metal shell plating resists corrosion, protecting the plugs from rust and wear over time. With these features, you get reliable starts and longer-lasting spark plugs that keep your bike running smoothly.

The ACDelco GM Original Equipment 41-162 Iridium Spark Plug features an iridium composition that provides high melting point and great strength, resulting in excellent wear resistance and durability. The spark plug offers reliable cold starting, quick acceleration, smooth performance, and excellent engine idle stability. The three-piece fired in suppressor seal meters spark energy for long electrode life, prevents combustion leakage, and blocks radio frequencies that can affect vehicle electronics. ACDelco GM Original Equipment parts are designed, engineered, and tested to rigorous standards for Chevrolet, Buick, GMC, or Cadillac vehicles.

Bosch Double Iridium Spark Plug is a high-performance spark plug designed for 07-10 Acura CSX, 07-09 Acura MDX, 05-08 Acura RL, 02-06 Acura RSX, 04-08 Acura TL, 04-08 Acura TSX, 03-07 Honda Accord, 02-11 Honda Civic, 02-09 Honda CR-V, 03-11 Honda Element, and 14 Honda Fit. It features a Double Iridium firing pin and ground electrode inlay, which provide 4X longer service life compared to standard copper plugs. The 0.6mm fine wire firing pin provides superior ignitability and performance. The 360 Degree continuous laser weld fuses corrosion-resistant iridium firing pin to the base for increased durability. With its OE design, Bosch Double Iridium Spark Plug is a pre-gapped replacement that delivers optimum fit, form, and function. The 7-year performance satisfaction guarantee ensures that you'll get your money's worth.

The ACDelco GM Original Equipment 41-109 Iridium Spark Plug offers excellent engine idle stability and smooth performance. The Iridium fine-wire electrode design allows for reliable cold starting and quick acceleration, while helping to burn away carbon deposits on the tip of the plug as they form. The one-piece suppressor seal helps block radio frequencies that can affect vehicle electronics and meters spark energy for long electrode life and combustion prevention. These parts are designed, engineered, and tested to rigorous standards, and are backed by General Motors, with GM regularly updating production and service part designs to integrate new materials and technologies.

The NGK Iridium IX Spark Plugs come in a convenient 4-pack, giving you enough plugs for multiple replacements or repairs. These are genuine NGK parts, ensuring you get high-quality, reliable components designed specifically for your vehicle. Each pack includes the original packaging and necessary hardware, so you have everything you need right out of the box. Plus, these spark plugs are direct replacements, making installation straightforward and hassle-free. Before purchasing, you can easily confirm if these spark plugs fit your vehicle using Amazon's fitment tool, helping you avoid compatibility issues and ensuring a smooth upgrade.

The NGK Iridium Spark Plug is designed for optimal performance in your Toyota Camry LE, specifically for the 2.5L engine. Its fine wire iridium center electrode offers exceptional durability and ensures a stable spark, which is crucial for efficient engine operation. With a high melting point, this spark plug is ideal for modern high-performance engines. Additionally, it features a copper core for better conductivity and a projected insulator type that enhances spark efficiency. Sold in a convenient four-pack, you'll have everything you need for a reliable ignition system.