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NGK Iridium IX Performance Spark Plugs (Mid 08-10 GT, Bullitt)

14 Reviews
Our Price

$89.99

(set of 8)
  • Item #64068
  • MPN#372

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  • Market Price $99.99
  • You Save 10% ($10.00)
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Customer Photos
Features
  • Iridium tip for a constant stable spark
  • Improves fuel economy and lower emissions
  • Heat Range: 7
  • NGK part# ZNAR6IX-11; NGK stock# 372
  • 12mm thread pattern
  • Fits 2008-2010 GT and Bullitt Mustangs w/ Brown coil boots
  • 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 Spark Plugs are specifically designed for the 2008-2010 GT and Bullitt Mustangs equipped with

Brown coil boots only.

Fitment: 2008 2009 2010 Details

Won't fit? Add an exception

What's in the Box
  • (8) Spark Plugs
    Hardware included:
  • None Required
Installation Info
Will it fit my Mustang?
  • Bullitt - 08, 09
  • GT - 08, 09, 10

Most Helpful Reviews

5/5
Great Spark Plugs

These NGK Iridium IX Performance Spark Plugs only took two hours to replace and have gave my 09 Mustang GT three MPG better gas milage around town, also my car runs so smooth! Thanks America Muscle for ...

Read More
Helpful (4)

5/5
Very good

Easy DIY install and runs smooth, great idle and feels like it has the list power back l! Product looks great the only compliment to this would be new performance coils!

Helpful (3)

Read All 14 Reviews
Overall Rating 4.9 out of 5 stars

Customer Photos (1) View All Photos

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5 Questions / 4 Answers

Ask a Question

What does a heat level on spark plugs mean? Whats better on spark plugs on its heat level plugs 6 or 7?

HectorLeeTrejo Year: 2009 Model: GT

  • Depends, hotter spark means you can burn more fuel, meaning better gas mileage, more power. hotter spark for NA engine, cooler spark for forced induction, depends on your application

    STANNNG Year: 2008 Model: GT Top 500 Contributor

    Good Answer (4)

Question Resolved

What is a Brown Coil Boot? I see that I must have it to install these plugs so what are they? I have a 2010 GT

EBoss Year: 2010 Model: GT

  • Hope this answers your question. It is the rubber part of the coil wire that fits over the spark plug

    Best Answer

    Midnightrider12 Year: 1991 Model: GT

    Good Answer (1)

Show 1 more answer Question Resolved

2008 bullitt brown? I have a 2008 bullitt does this mean i automatically have the brown covers? or only do a certain ammount of buliltts have the brown covers and the rest have the black? How do I check?

beachbumm32 Year: 2008 Model: Bullitt

  • Quickest way to find out is to just take the boot out and look at the color. I was wondering the same thing when I was working on my car and noticed the boot color when I took them out to replace the spark plugs.

    GenoD Year: 2008 Model: GT

    Good Answer (0)

Question Resolved

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Customer Reviews (14) Write a Review

Overall Rating 4.9

out of 5 stars

Installation Time:Less than 1 Hour

  • Performance Gain 4.214286 4.2
  • Fit 4.714286 4.7
  • Bang For Your Buck 4.615385 4.6



  • 5/5

    Installation Time: Afternoon

    November 08, 2012

    Great Spark Plugs

    These NGK Iridium IX Performance Spark Plugs only took two hours to replace and have gave my 09 Mustang GT three MPG better gas milage around town, also my car runs so smooth! Thanks America Muscle for the great price! Rich Stanley

    Lich

    Year: 2009 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 3 Fort Walton Beach, FL, USA

    Helpful (4) (0)

  • 5/5

    Installation Time: Less than 1 Hour

    July 27, 2012

    Very good

    Easy DIY install and runs smooth, great idle and feels like it has the list power back l! Product looks great the only compliment to this would be new performance coils!

    Allblackbullitt

    Year: 2009 Model: Bullitt Driving Style: Daily Driver 'Stangs I have owned: 4

    Helpful (3) (0)

  • 5/5

    Installation Time: Less than 1 Hour

    July 26, 2012

    A MUST HAVE!

    these are a must have cause for the price n time it takes to put them on it just great. also i have a 2010gt and almost about to hit 30k miles and the motor started to have some miss fires while driving the car little hard or starting the car at times. and now having these on for about a week now the car is running like new. you can hear n feel the difference once you turn on the car it jut great. gas mileage did go up and all threw the gears you can feel the difference especlly on 5th. but im really happy i went with these plugs. let me include as aways shipping was extremlly fast thanks AM!

    andycoll

    Year: 2010 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 1 NY

    Helpful (3) (1)

  • 5/5

    Installation Time: Afternoon

    July 24, 2013

    Great replacement product

    Bought these plugs to do my 80,000 mile maintenance on my 2010 GT. Very easy install if you take your time and make sure to keep the area clean. Compressed air in a can helps a TON. Install time was only a couple of hours and there was an instantaneous improvement on drivability, mainly in the smoothness of the vehicles idle. Wouldn't say I felt too much power gain but thats not what I was after. Great product with a reasonable price.

    grabberbluemach

    Year: 2010 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 3 Pontiac, MI, USA

    Helpful (1) (0)

  • 5/5

    Installation Time: Less than 1 Hour

    June 11, 2013

    They Spark

    I installed these plugs with a set of MSD COPs. The car now runs a lot smoother and sounds better as well. Definitely worth the few extra $$.

    Top 50 Contributor

    DevGittinJr

    Year: 2009 Model: Bullitt Driving Style: Daily Driver 'Stangs I have owned: 2 Longview, TX

    Helpful (1) (0)

  • 5/5

    Installation Time: Less than 1 Hour

    June 07, 2013

    ELGRANREY SAYS

    these plugs are great. I felt a VERY noticeable power gain and the car runs smoother than ever now.

    Tomas

    Year: 2008 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 3 Newport News, Virginia

    Helpful (1) (0)

  • 5/5

    Installation Time: Afternoon

    March 23, 2013

    Great product

    Definitely worth the money! Any other auto parts store would have sold me a cheaper set of spark plugs for the same price but not AM! I definitely feel a difference in performance and I've gained gas mileage. First time changing out spark plugs so it took me a little bit but the longest part was waiting on the liquid wrench to soak through. All in all an outstanding product! Thanks AM!

    GenoD

    Year: 2008 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 1 Suffolk, VA, USA

    Helpful (1) (0)

  • 5/5

    February 22, 2013

    Excellent Spark

    This product is worth its money. Just by itself installed you get your performance you lost through simply having them long miles on your stang. Its an easy remove and replace process But if you have you own tuner or would like to go to your own speed shop and have your car tuned and tweaked to get the absolutely most out of it that's a great idea too!

    virginiaBEAChBULLITT

    Year: 2008 Model: Bullitt Driving Style: Street / Strip 'Stangs I have owned: 1 Virginia Beach, VA, USA

    Helpful (1) (0)

  • 5/5

    Installation Time: Less than 1 Hour

    July 07, 2013

    Excellent Spark Plugs

    Excellent product. I would recommend this to anyone who needs new spark plugs.Very easy to install. I was able to install within an hour.

    rangerbert

    Year: 2008 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 4 Union City Pa

    Helpful (1) (1)

  • 4/5

    Installation Time: Less than 1 Hour

    May 06, 2013

    Good product

    It good fit over all but does not fit normal spark plug sockets l i installed them and noticed a improvement

    davie55555

    Year: 2010 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 1 Texas, USA

    Helpful (0) (1)

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