NGK BKR5EIX-11 Iridium IX Spark Plugs (4)

Upgrade your ignition system with this set of 4 NGK BKR5EIX-11 Iridium IX spark plugs. Designed for performance enthusiasts and modern engine applications, NGK Iridium IX plugs provide strong ignitability, stable spark performance, and long-lasting durability compared to standard nickel alloy spark plugs.

The BKR5EIX-11 features a fine-wire iridium center electrode, tapered-cut ground electrode, solid copper core, and trivalent metal plating. The 0.6mm iridium tip helps produce a consistent spark, while the tapered-cut ground electrode helps reduce quenching for improved ignition efficiency and throttle response.

This plug is built with a 98% pure copper core for efficient heat dissipation, helping reduce overheating and support reliable starts. NGK’s trivalent plating also provides corrosion resistance and anti-seizing properties for easier installation and removal.

This listing is for 4 spark plugs, making it a convenient set for many 4-cylinder applications. Always confirm plug fitment, heat range, and gap requirements before ordering.

Features

• Genuine NGK Iridium IX spark plugs

• Part number: BKR5EIX-11

• Sold as a set of 4 plugs

• Manufacturer heat range: 5

• Fine-wire iridium center electrode

• 0.6mm iridium tip center electrode

• Tapered-cut ground electrode

• Solid 98% pure copper core for heat dissipation

• Trivalent metal plating for corrosion resistance

• Resistor type plug

• Gasket / flat seat design

• Crush washer included

• Recommended for modified, high-performance, or OE nickel alloy spark plug upgrade applications

Spark Plug Specs

Part Number: BKR5EIX-11
Plug Type: NGK Iridium IX
Thread Size: M14 x 1.25
Reach: 19.0mm / 0.750 in
Hex Size: 5/8 in / 16mm
Pre-Gap: 1.1mm / 0.044 in
Seat Type: Flat / gasket seat
Terminal Type: Non-removable nut
Resistance: 5000 ohms
Ground Electrode: J-gap, nickel, tapered-cut tip
Center Electrode: Iridium fine wire with copper core
Insulator Material: Ceramic

Important Fitment Note

Confirm vehicle fitment, spark plug heat range, and gap requirements before installation. Spark plug selection can vary based on engine, modifications, fuel type, compression, boost level, and tuning setup.

What’s Included

• 4 NGK BKR5EIX-11 Iridium IX spark plugs