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NGK Iridium IX Spark Plugs; Heat Range 6 (03-04 Mustang Cobra; 07-14 Mustang GT500)

Item 525003
AmericanMuscle no longer carries the NGK Iridium IX Spark Plugs; Heat Range 6 (03-04 Mustang Cobra; 07-14 Mustang GT500). Please check out 2015-2022 Mustang Spark Plugs & Spark Plug Wires for an updated selection.
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    Product Information

    Features, Description, Reviews, Q&A, Specs & Installation

    Features

    • Perfect for Stock Boost
    • Iridium Tip for a Constant Stable Spark
    • Improves Fuel Economy and Lower Emissions
    • Heat Range: 6
    • NGK Part# TR6IX; NGK Stock# 3689
    • 14mm Thread Pattern
    • Spark Plug Reach 0.690"
    • Fits 2003-2004 SVT Cobra and 2007-2014 Shelby GT500
    • Sold as a Set of 8

    Description

    High Performance. Keeping your Mustangs high performance engine running smoothly and efficiently is important, so routinely replace your old weak plugs with a new set of NGK Iridium IX Performance Spark Plugs for constant reliable spark power. The Iridium IX plugs from NGK will provide improved throttle response, fuel efficiency, lower emissions, and will reduce fouling.

    Superior Materials. NGK Iridium IX Performance Spark Plugs feature a copper core electrode for its superior conductivity and an iridium tip (which is 6X harder than platinum) for it's extremely high melting point, perfect for keeping your Mustangs high-performance engine running at it's peak. And as an added bonus the Iridium IX plug features Trivalent Metal Plating for it's superior anti-corrosion and anti-seizing properties.

    Application. This set of eight (8) NGK Iridium IX Performance "Heat Range 6" Spark Plugs are specifically designed for the 2003-2004 SVT Cobra and 2007-2014 Shelby GT500 Mustangs that are running stock boost.

    CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

    Installation & What's in the Box

    Installation Info

    Installation Time

    (approx) 2 Hours

    Difficulty Level:

    Light to Moderate mechanical skill required.

    Installation Guides

    What's in the Box

    • (8) Spark Plugs

    Tech Specs

    4.9

    Customer Reviews (100+)

      Questions & Answers

      10 More Questions

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