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

Market Price $99.99 You Save 10% ($10.00)

$89.99 (set of 8)

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  • Item 64068
  • MPN#372

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Features & Details

  • Iridium Tip for a Constant Stable Spark
  • Improves Fuel Economy and Lower Emissions
  • Heat Range: 6
  • NGK Part# ZNAR6IX-11; NGK Stock# 372
  • 12mm Thread Pattern
  • Sold as a Set of 8
  • Fits 2008-2010 GT and Bullitt Mustangs w/ Brown Coil Boots
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

What's in the Box
  • (8) Spark Plugs
Installation Info
Will it fit my Mustang?
  • Bullitt - 08, 09
  • GT - 08, 09, 10

Most Helpful Reviews

5/5
Definitely recommend!

Easy install, took about an hour and a half. The car felt like new, from a stop I could let up the clutch a little quicker, the shifts feel smoother, and it fells like the car is able to pull a little ...

Read More
Helpful (1)

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)

Overall Rating 4.9 out of 5 stars
Read All 18 Reviews

Customer Photos (1) Submit Your Photo

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7 Questions / 7 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

  • 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

    Good Answer (5) (0)

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

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

  • The boot coil color changed some time in 2008 from black to brown. Your 2010 would have a brown boot. Hope this helps!

    LisaS

    Good Answer (1) (0)

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

  • 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

    Good Answer (0) (0)

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Will the NGK Iridium plugs work with MSD coil plug set? Will these plugs work with MSD coil plug set?

ITALIANO

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

Nitrous? I have these in my car now, will these work with nitrous?

piezan76

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

So i recently bought an 07 GT/CS 4.6L 3v, The car did not come stock, i popped the hood and reviled the fact that the 4.6 was equipped with a full set of the MSD Blaster pack on plug coil packs, I have no clue if these plugs will work because i have never seen the original boot or coils, will they fit?, The reason i ask is mainly because i am replacing my plugs and possibly my packs as well, due to miss-firing in cylinder 3 and another random cylinder as the dealers told me after a diagnostic, the car also has high flow cats and JBA headers not sure if they are longs or shorts tho, i noticed the problem after my first test drive and usually happens only on full throttle, i was running 93octane pump gas and using 112 octone booster when it started getting really bad.

LeadFoot

  • Your 07 would utilize the of-early 08 style plug design. The only year where the color of the coil boots would need to be checked would be a 2008 model year car.

    AMSam

    Good Answer (0) (0)

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Customer Reviews (18) Write a Review

Overall Rating 4.9

out of 5 stars

Installation Time:Less than 1 Hour

  • Performance Gain 4.2 4.2
  • Fit 4.733333 4.7



  • 5/5

    Installation Time: Afternoon

    May 18, 2016

    Definitely recommend!

    Easy install, took about an hour and a half. The car felt like new, from a stop I could let up the clutch a little quicker, the shifts feel smoother, and it fells like the car is able to pull a little harder in every gear (especially in the higher gears). Overall very happy with the purchase.

    Cetter21

    Year: 2010 Submodel: GT

    Helpful (1) (0)

  • 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 Submodel: GT 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 Submodel: Bullitt

    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 Submodel: GT 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 Submodel: GT 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 $$.

    DevGittinJr

    Year: 2009 Submodel: Bullitt 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 Submodel: GT 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 Submodel: GT 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 Submodel: Bullitt 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 Submodel: GT 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 Submodel: GT Texas, USA

    Helpful (0) (1)

  • 5/5

    September 14, 2016

    BlackStang

    Great spark and improvement from stock plugs did an excellent job

    Blac749

    Year: 2009 Submodel: GT

    Helpful (0) (1)

  • 5/5

    August 29, 2016

    NGK Iridium IX Performance Spark Plugs

    Smoothed out the idle and feels like there is a little more power on my 08 Bullitt, that has 32k miles. Well worth the purchase.

    Bob

    Year: 2008 Submodel: Bullitt

    Helpful (0) (0)

  • 5/5

    August 25, 2016

    NGK IX

    Easy install, more power, better idle, faster start up. I also installed the SR coils with these NGK IX plugs. Pulls a little harder from 3000-6700rpms.

    FstEddie

    Year: 2010 Submodel: GT

    Helpful (0) (0)

  • 5/5

    Installation Time: Less than 1 Hour

    March 08, 2014

    Eh.

    Car was at 83k miles so I figured I would change out plugs. Took about an hour and luckily I didn't break any, so everything went smooth. The plugs I took out were still VERY clean, so I didn't notice much of a difference. Guess it's just an accepted maintenance cost.

    ConfusedGuy

    Year: 2009 Submodel: GT Fort Lee, VA, USA

    Helpful (0) (0)

  • 5/5

    Installation Time: Afternoon

    October 01, 2013

    I really didn't think plugs would make a difference.

    My mustang is more powerful, smooth, and faster response with these plugs. Better than when I drove it off the lot brand new. So happy with these plugs. Note: I also added the Acel coil packs, which are great also.

    Mo2010

    Year: 2010 Submodel: GT Waldorf, MD

    Helpful (0) (0)

  • 5/5

    Installation Time: Less than 1 Hour

    July 24, 2013

    Spark plugs

    Very easy to install and definitely worth the money. Savings on gas mileage will pay for the spark plugs alone. Plus engine runs a lot better. So go ahead and add them to your cart.

    CHIEPH88

    Year: 2009 Submodel: GT Lovington, NM 88260, USA

    Helpful (0) (0)

  • 5/5

    Installation Time: Less than 1 Hour

    July 01, 2013

    Let the ponys loose

    I was having some misfires with the original plugs but they lasted well into the 50k after installing this new NGK Iridium Spark Plugs all I can say is that I had awaken a sleeping giant ! The MPG in the highway went from 24to a 26.6 I think that is awesome ! Also the response at the throttle was crispier all I can say is Thanks AM ! My pony feels alive again...

    Rafael

    Year: 2010 Submodel: GT Port Charlotte Florida

    Helpful (0) (0)

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