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

Market Price $99.99 You Save 10% ($10.00)
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$89.99 (set of 8)

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  • Item 64068
  • MPN#372

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    Features, Video & 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

    Review & Installation Video

    Review & Install Video

    These are the NGK iridium spark plugs for mid-2008 to 2010 GT and Bullet Mustangs. These NGK iridium spark plugs have a heat range of six, which is the same heat range of the factory plugs. Now being the same heat range means that these plugs are gonna be a good option for those that have a stock setup or one with basic bolt-ons. If you have a forced induction Coyote, you'll need to make sure that you go with a colder heat range plug. So, a turbo, super charger, nitrous build would need the step cooler plug. But if you have a naturally aspirated build and you're looking for a performance plug, I would suggest these plugs, since they have the same heat range and these are a good stock replacement upgrade. I will say though, that these are for the Mustangs that are equipped with the brown coil boots only. The install for spark plugs is very easy on the Coyote. It's a one outta three wrenches in the difficulty meter, and you can plan on spending about a half an hour's time. So, heat range is something that's important to pay attention to when you're shopping for spark plugs. Different builds and setups require different heat ranges. It all depends on your mod list. The heat range of the plug is a range where the plug works well thermally. And of course your modifications, or lack thereof, will determine the temperature where the spark plug will be operating. You wanna make sure you're getting a plug in the right heat range, so the plug can function normally and so you won't have fouling or pre-ignition. The heat range on this plug is a six, and the way NGK labels their plugs is the lower the number the hotter the type of plug. The higher the number, the cooler the type of plug. These spark plugs still have a copper core electrode and the iridium is in the tip of the plug. Iridium is a very strong material and has a very high melting point which makes it perfect for performance-based applications. The core in the iridium tip are gonna be determining factors of the heat range of the plug. When it comes to price, you can expect to pay just south of the 100 dollar mark for a set of eight plugs. This is the same as what you can expect to pay for other brands of plugs, so I wouldn't say that the price is crazy here. Your other options include: Ford Performance, Autolite, Ford Motorcraft and Brisk makes an offering for boost that are also very close in price. So the NGK here isn't your only option, but they are your only option if you're specifically looking for an iridium plug. As far as the install goes, this is an easy install and it's a one outta three wrenches in the difficulty meter. You'll need a few tools and some anti-seize for the spark plug threads. The coils will need to come off so you can disconnect the electrical plugs and unbolt each coil pack. Once the coil packs are out of the way, you have access to the spark plugs. If you want, you can use some PB Blaster to help loosen the plugs up before you dive in with your socket to remove the plugs. I would suggest putting some anti-sieze on the threads of the new spark plugs and make sure the plugs are all gapped the same before you install them. Once you've swapped all of the plugs, reinstall the coil packs, plug them back in, and that's all it's gonna take. Wrapping things up here, these are the NGK iridium spark plugs for mid-2008 to 2010 GT and Bullet Mustangs. As always, you can check them out more online right here at americanmuscle.com.

    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

    CA Residents: Warning: California's Proposition 65

    What's in the Box
    • (8) Spark Plugs
    Installation Info
    Tech Specs
    Will it fit my Mustang?

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    Questions & Answers (17)

    5 Top Rated Questions

    it says to drop 1 heat range for every 75-100 hp added. what is the factory heat range?

    • The NGK Iridium IX Performance Spark Plugs would share the same heat range of the OEM plugs, coming in at heat range 6.

    Helpful (1)

    Is the gap of these NGK plugs set to 0.40-0.50? It seems like a lot of people have installed their new NGK plugs without checking the gap but have had no problems.

    • We do not have the spec at what these NGK plugs are set to out of the box, they would be close to factory spec but we always recommend double checking the plug gap before installation to ensure proper performance.

    Helpful (1)

    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.

    • 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.

    Helpful (1)

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

    • Yes it will

    Helpful (1)

    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

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

    Helpful (1) Show 1 more answer
    Post Your Question
    10 More Questions
    Would these fit on my 2006 GT? Thanks 1 answer
    Are these one piece design? 1 answer
    Can these fit on 2005 mustang GT? 1 answer
    Will these fit my 06 mustang gt? 1 answer
    is the gap preset 1 answer
    Do these plugs require a tune after installing with a set of MSD blaster coil plugs 1 answer
    So my mustang has recently thrown a random misfire code and was thinking about going with MSD coil packs as I've heard that would help. Any ideas of what spark plugs would be a good match for the MSD coils? By the way, the car has FRRP intake manifold and Hot Rod Cams, GT500 throttle body, K N cold air intake and BBK shorty headers. 1 answer
    Since it says 08-10GT I probably can't use these in my 07 GTCS then can I? Or will it be able to be used with no problems? If not which plugs do you think I should go with here on AM? 1 answer
    I want to add a nitrous kit and run 150 shot what are the correct plugs will I need and can I get them at AM my car has a cai with a bama race tune and should I go with 4:10 or 3:73 gears 1 answer
    Nitrous? I have these in my car now, will these work with nitrous? 1 answer

    People Who Bought This Item Also Bought

    Customer Reviews (37) Write a Review

    Overall Rating 5

    out of 5 stars

    Installation Time:Afternoon

    Installation Cost:0-$100

    • Performance Gain 4.441176 4.4
    • Fit 4.882353 4.9



    • 5/5

      Installation Time: Less than 1 Hour

      September 24, 2018

      excellent product for the price.

      as said in the title, good stuff you can't beat the price.

      The4p6thatcould

      Year: 2010 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Less than 1 Hour

      August 13, 2018

      Excellent spark plugs. Best bang for your buck.

      Spark plugs feel and look like good quality. Car runs Awsome.

      Arodnasty

      Year: 2010 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Less than 1 Hour

      August 08, 2018

      Good

      It was perfect on my end. Everything for just well

      NytollaW

      Year: 2008 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Less than 1 Hour

      July 02, 2018

      Reliable

      Had these plugs before and they work like a charm. Absolutely no problems with these. I get about 60,000 between changes! highly recommend these for the 4.6 3V.

      Jf721

      Year: 2009 Submodel: GT

      Helpful (3)

    • 5/5

      Installation Time: Afternoon

      April 13, 2018

      Great replacements

      Easy to install, great replacements. Wasn't looking for any gains or anything.

      gunstar

      Year: 2010 Submodel: GT

      Helpful (4)

    • 5/5

      Installation Time: Less than 1 Hour

      April 02, 2018

      Feel a difference

      These performance spark plugs gave my mustang alittle more power from the stock ones.

      Gunner

      Year: 2010 Submodel: GT

      Helpful (3)

    • 5/5

      Installation Time: Less than 1 Hour

      March 23, 2018

      Great Product

      Replacing my old worn out factory spark plugs with these by NGK didn't hurt my pockets and I love the performance results. Definitely a must have for the naturally aspirated 3V 4.6L.

      DariusS

      Year: 2010 Submodel: GT

      Helpful (4)

    • 5/5

      Installation Time: Less than 1 Hour

      March 14, 2018

      NGK Iridium IX Performance

      Awesome Plugs! Good extra power! And smooth! Easy installation!

      RobertMcguire

      Year: 2008 Submodel: GT

      Helpful (3)

    • 5/5

      Installation Time: Less than 1 Hour

      March 09, 2018

      Perfect fit

      These spark plugs are good for better performance and the best of all the gas mileage.

      Vic

      Year: 2010 Submodel: GT

      Helpful (3)

    • 5/5

      Installation Time: Less than 1 Hour

      February 03, 2018

      NGK Iridium Sparkplugs

      Better gas mileage, better throttle response, smoother driving and idling...everything you would expect. Definitely better than OEM highly recommend them for the extra $10.

      BrandonV

      Year: 2008 Submodel: GT

      Helpful (3)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: 0-$100

      September 22, 2017

      Awesome

      Add lost power from old spark plugs! Work perfect especially when 3 of mine were shot!

      TJ

      Year: 2010 Submodel: GT

      Helpful (4)

    • 5/5

      Installation Time: Less than 1 Hour

      September 05, 2017

      NGK without a doubt

      It was time to do some maintenance with my 07 which has an 08 motor in it thankfully. These plugs were all ready to go outside of the box and only took me about 30 minutes or even less to install. Super easy and she sounds much more smooth now. I wouldn't expect any performance gains but rather free up some power that was lost from worn out parts. But I would definitely recommend these to anyone that wants to replace their spark plugs on any 08 to 10 4.6.

      Cantcatchsilverbullitt

      Year: 2007 Submodel: GT

      Helpful (4)

    • 5/5

      Installation Time: Less than 1 Hour

      June 25, 2017

      Great spark plugs

      I waited until I had 60k miles on my engine before worrying about replacing spark plugs. I did not have a running problem from the old ones but I didn't want to wait that long. These plugs are easy to put in and I have noticed easier starts. I can't say there's a night and day difference but you'll need to replace them sooner or later so why not now?

      Carl

      Year: 2010 Submodel: GT

      Helpful (3)

    • 5/5

      June 11, 2017

      Excellent Replacement Plug

      These plugs are very nice and I do recommend them. I installed the NGK Iridium IX plugs along with the MSD Blaster Coil On Plug Set. I checked the gap on the plugs and they were all within spec so I was set. Using a quick shot of PB Blaster allowed the old plugs to come out rather easy. I took my time and used plenty of air to keep any debris out of the engine. From start to finish took a couple of hours. Again, these plugs are great and I recommend them. D.

      dben

      Year: 2010 Submodel: GT

      Helpful (3)

    • 5/5

      Installation Time: Afternoon

      March 22, 2017

      Great plugs!

      Great plugs! Installed myself without a problem and it was my first time installing spark plugs. Car has slightly more noticeable throttle response and is accrlerates/decelerates smoother.

      Dom

      Year: 2008 Submodel: GT

      Helpful (3)

    • 5/5

      Installation Time: Less than 1 Hour

      February 26, 2017

      Great product

      I was really thinking of not doing my self since I'm close to 90k and the previous owner bever touched them but decided to go a head and change them out . Install was really easy just had to take my time getting them out. Car runs way better with these spark plugs. Worth every penny .

      JohnnyA

      Year: 2010 Submodel: GT

      Helpful (4)

    • 5/5

      Installation Time: Shop Install

      February 06, 2017

      NGK Iridium spark plugs

      I highly recommend these. It was a night and day difference from the factory spark plugs. The extra performance was immediately noticeable. I had them installed while i had all the fluids changed. Excellent product.

      Steve

      Year: 2010 Submodel: GT

      Helpful (5)

    • 5/5

      February 06, 2017

      NGK iridium spark plugs

      Nice product combine with Grantelli 3v Street fighter coil packs seem to get great response on top end and fires up like a beast

      09slayer

      Year: 2009 Submodel: GT

      Helpful (4)

    • 5/5

      Installation Time: Less than 1 Hour

      December 31, 2016

      Great!

      The spark plugs are absolutely great. No problems whatsoever! Highly recommended!

      Frosty

      Year: 2010 Submodel: GT

      Helpful (5)

    • 5/5

      September 14, 2016

      BlackStang

      Great spark and improvement from stock plugs did an excellent job

      Blac749

      Year: 2009 Submodel: GT

      Helpful (4)

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