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NGK Iridium IX Performance Spark Plugs - Heat Range 8 (03-04 Cobra; 07-14 GT500)

1 Reviews
Our Price


(set of 8)
  • Item #64072
  • MPN#3691

  • Market Price $99.99
  • You Save 10% ($10.00)
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  • Perfect for Increased Boost
  • Iridium Tip for a Constant Stable Spark
  • Improves Fuel Economy and Lower Emissions
  • Heat Range: 8
  • NGK Part# TR8IX; NGK Stock# 3691
  • 14mm Thread Pattern
  • Spark Plug Reach 0.708"
  • Fits 2003-2004 SVT Cobra and 2007-2014 Shelby GT500
  • Sold as a Set of 8
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) Two Heat Range Cooler NGK Iridium IX Performance Spark Plugs are specifically designed for the 2003-2004 SVT Cobra and 2007-2014 Shelby GT500 Mustangs that are running more boost.

Fitment: 2003 2004 2007 2008 2009 2010 2011 2012 2013 2014 Details

What's in the Box
  • (8) Spark Plugs
    Hardware included:
  • None Required
Installation Info
Will it fit my Mustang?
  • GT500 - 07, 08, 09, 10, 11, 12, 13, 14
  • Cobra - 03, 04

Customer Photos

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2 Questions / 1 Answers

Ask a Question

Do these spark plugs plug and play or needs to be gap for gt500?

sergioGT500 Year: 2009 Model: GT500

  • The spark plugs do come pre-gapped; however, with any spark plug - these included - it is highly recommended that each plug be checked prior to installation to ensure that everything is as it should be!

    LisaS Year: 1992 Model: GT

    Good Answer (0)

Question Resolved

Ford racing 750 HP Kit I have 2012 Shelby GT 500 in the process of installing a ford racing 750 HP Supercharger Kit with long tube headers catted X Pipes and manga flow cat back system! Which spark plugs and coil on plug kits can I use to complement this setup Thanks

RajunCajun Year: 2012 Model: GT500

Answer This Question I need this answered (1) (0)

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Customer Reviews (1) Write a Review

Overall Rating 5.0

out of 5 stars

Installation Time:Afternoon

  • Performance Gain 5 5
  • Fit 5 5
  • Bang For Your Buck 3 3

  • 5/5

    Installation Time: Afternoon

    February 07, 2016

    Very good but a little pricey

    I bought these a wile ago and they work amazing well. I was having some idling issues and these completely fixed that as well as adding to the responsiveness of my car. My only complaint is that they are a little pricey, other than that I love them. Great job AM!


    Year: 2003 Model: Cobra Driving Style: Race 'Stangs I have owned: 2 Corvallis, OR

    Helpful (0) (0)

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