NGK Iridium IX Spark Plug Box of 4 (LTR6IX-11) (ngk6509)

This is the NGK Iridium IX Spark Plug Box of 4 (LTR6IX-11). Part ngk6509. Ignition parts (coils, plugs and wires) deliver a strong, consistent spark.

NGK Iridium IX spark plugs are specifically designed for the performance enthusiast. Iridium IX provides outstanding acceleration, high fuel efficiency and durability. NGK Iridium IX plugs offer extreme ignitability and exceptional anti-fouling. Tapered cut ground electrode provides improved starting, idling and throttle response. The Iridium fine wire center electrode's durability is six times harder than platinum. Iridium alloy's extremely high melting point is perfect for today's engines. For even greater performance consider upgrading to an NGK Ruthenium HX plug.

Features and benefits

• RECOMMENDED USAGE: Modified or high performance applications, or as an upgrade to OE nickel alloy spark plugs
• Trivalent metal plating for superior anti-corrosion and anti-seizing properties
• Outstanding acceleration, high fuel efficiency and durability
• Fine iridium tip ensures durable and consistent spark

Product details

• Part type: Ignition
• Brand: NGK
• Resistance: 5000.0
• Ground Electrode Tip Design: Taper Cut
• Ground Configuration: Standard
• Ground Electrode Core Material: Nickel
• Electrical Terminal Type: Non-Removable Nut
• Center Electrode Core Material: Copper
• Center Electrode Tip Material: Iridium
• Pre-Gap Size: .044
• Ground Electrode Quantity: 1
• Hex Size: 5/8
• Insulator Height: 53.00
• Manufacturer Heat Range: 6
• Seat Type: Tapered
• Reach: 25.00
• NGK part number: ngk6509

Fitment

• Vehicle: Chevrolet Camaro (5th Gen), Ford Mustang (S197), Ford Mustang (S550), Mazda Miata MX-5 (NC)
• Years and trims on file: 2010-2015 Chevrolet Camaro LS; 2010-2015 Chevrolet Camaro LT; 2011-2014 Ford Mustang Base; 2012-2013 Ford Mustang Boss 302; 2019 Ford Mustang Bullitt; 2011-2019 Ford Mustang GT; 2015 Ford Mustang GT 50 Years Limited Edition; 2015-2019 Ford Mustang GT Premium; 2015-2018 Ford Mustang Shelby GT350; 2015-2018 Ford Mustang Shelby GT350R; 2015-2017 Ford Mustang V6
• Application listing: NGK Iridium IX Spark Plug Box of 4 (LTR6IX-11)
• Check the vehicle, model years, engine and trim above against your car before ordering. Not sure? Ask us and we will check it against your VIN.

Shipping & returns

• Orders are processed within 1–3 business days; standard delivery is 3–7 business days within the United States.
• NGK parts are supplied through our distributor. We confirm availability and lead time with you after you order.
• We currently ship within the U.S. only. See our Shipping Policy.
• 30-day returns on unused parts in original packaging — see our Return Policy.

Installation at Team ANBD

Team ANBD is a performance shop in Andover, New Jersey. We can align or corner-balance the car, and prep track cars. Book an appointment or ask us about installation and fitment before you order.