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NGK Iridium IX Performance Spark Plugs - Heat Range 7 (11-17 GT; 12-13 BOSS 302)

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

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  • Item 64064
  • MPN#6510

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    Features, Video & Details

    • Perfect for Nitrous and Force Inducted Engines
    • Iridium Tip for a Constant Stable Spark
    • Improves Fuel Economy and Lower Emissions
    • Heat Range: 7
    • NGK Part# LTR7IX-11; NGK Stock# 6510
    • 14mm Thread Pattern
    • Fits 2011-2017 GT and 2012-2013 BOSS Mustangs
    • Sold as a Set of 8

    Review & Installation Video

    Review & Install Video

    Stephanie: Hey guys. Stephanie with AmericanMuscle.com, here with the review of the NGK Iridium spark plugs for 2011 and newer GT Mustangs and 2012 to 2013 Boss Mustangs. These NGK Iridium spark plugs have a heat range of seven, which is one heat range cooler than the factory plug. Being a cooler plug, these plugs are going to be a go to option for those forced induction coyotes out there or a nitrous car. So, turbo, supercharger and nitrous build would need the step cooler plug. If you have a naturally aspirated build and you're looking for a performance plug, I would suggest the NGK laser Iridium plugs, because those are still at a heat range of 6. Which is what you need for an NA car. So, heat range is something that's important to pay attention to when you're shopping for a spark plug. Different builds and set-up require different heat ranges, it all depends on your mod list. The heat range of the plug is where the plug works both thermally and of course your modifications or lack there of, will determine the temperature where the spark plug will be operating. You want to 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 of these plugs is seven, and the way NGK labels their plugs is kind of opposite. 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 high melting point, which makes it perfect for the performance based application. The core and the iridium tip are going to be the determining factors of the heat range of the plug. When it comes to price, you can expect to pay just south of the hundred dollar mark for a set of eight plugs. This is the same as what you can expect to pay for other brands and plugs for forced induction cars, so I wouldn't say that the price is crazy here. Both Ford Performance and Brisk, make offerings for boost and they're very close in price. So, the NGK here isn't your only option, but they are your only option if you are specifically looking for an iridium plug. As far as the install goes, this is an easy install and it's a one out of three wrenches in the difficulty meter. You 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 pulling one out at a time and replacing each old plug with a new, freshly gapped plug with anti-seize on the threads. Rinse all the coil packs, plug them back in and that's all it's going to take. Wrapping things up here with the NGK Iridium spark plugs, these plugs have an iridium tip and heat range of seven. Which makes them a colder plug. They're perfect for forced induction or nitrous cars. 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) One Heat Range Cooler NGK Iridium IX Performance Spark Plugs are specifically designed as an upgrade for nitrous or force inducted 2011-2017 GT and 2012-2013 BOSS Mustangs equipped with the 4 valve 5.0L Coyote engine.

    Fitment: 2011 2012 2013 2014 2015 2016 2017 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 (16)

    5 Top Rated Questions

    If i have a stock 5.0 would these plugs work for my car and what gap would i need i keep getting .45 or .50

    • The NGK Iridium IX Performance Spark Plugs would not work well with a stock 5.0 as they have a heat range designed around boosted and nitrous applications. The stock plug gap is 0.049 to 0.053.

    Helpful (1)

    I noticed that these are the spark plugs that are recommended as plugs for modded ecoboost mustangs. Are these pregapped for the 2015 ecoboost mustang, and are there any restrictions or issues about using this plug?

    Are these spark plugs pre-gapped for the Mustang 5.0? I have a Procharged 2015 Mustang and I'm wondering if it'll work.

    • Yes, these spark plugs are pre-gapped at the factory specs. We would recommend speaking with your tuner regarding you gap specifications as you would need to adjustit before these are installed. 

    Helpful (0)

    Hello I wanted to ask about NGK Iridium IX Performance Spark Plugs - Heat Range 7 I have Mustang GT 2017 with JLT CAI and Borla S-Type catback and Bama Race Tune for daily use . My questions is , It will fit my car ? And it will improve the response when i hit all the paddle ? If not what will do ? Because i’m felling that there is more power but there is a little slow response . Thank you !

    • These Spark Plugs are best used in forced induction applications, however, as long as they are gapped correctly for your vehicle they will work with your application. These would help with your throttle response. 

    Helpful (0)

    Hello, is there a specific type of spark plug that would be recommended for e85 fuel?

    • Using E85 will not require new spark plugs. Generally for every 75-100hp you add, you will want to get a spark plug 1 heat range colder.

    Helpful (0)
    Post Your Question
    10 More Questions
    Aren’t these the same as the the FP M-12405-M50A plugs? 1 answer
    I'm going to run nitrous but I won't be using it right away . Can I still get the plugs 1 answer
    Hey I have a 2012 5.0 with boss 302 manifold, off road x pipe with roush axelbacks, Jlt Cai, and a Bama tune are these good for me? Or should I consider getting something else thanks. 1 answer
    So I plan on getting these for my Nitrous application. When I am not at the track using it will they be fine for every day use when traveling or will i have to change the plugs every time i go to the tarck? 1 answer
    I just added the 302 intake to my 2014 gt will these go with my car? I also have a preformance tune, airaid intake ,3.73s and x-pipes. 1 answer
    I have headers, catback tune and CAI on my 2015 5.0 GT revs up to 7000 rpm my stock spark plug are out, would this be an ideal replacement ? Along a preformance Coil pack 1 answer
    What is the recommended gap for these with a bolt on 2012 GT? 1 answer
    If I buy these for a non supercharged/non boosted medium bolt on GT would they hurt my car at all with the heat range being at 7 compared to the NGK laser heat range 6? 1 answer
    What is the firing order for the 2013 gt? Is there a diagram? Paint me a picture for example. 1234-driver side 5678-passenger side 1 answer
    is it necessary to change the coils after changing the spark plugs? 1 answer

    People Who Bought This Item Also Bought

    Customer Reviews (38) Write a Review

    Overall Rating 4.9

    out of 5 stars

    Installation Time:Less than 1 Hour

    Installation Cost:0-$100

    • Performance Gain 4.552631 4.6
    • Fit 4.973684 5.0



    • 5/5

      Installation Time: Less than 1 Hour

      August 06, 2018

      Easy install

      One of my plugs went out this was an amazing upgrade.

      JustenG

      Year: 2015 Submodel: GT

      Helpful (1)

    • 4/5

      July 20, 2018

      Great plugz

      Great plugz, felt the horse power come back to the engine

      ErnestoR

      Year: 2011 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Less than 1 Hour

      June 26, 2018

      NGK’s #7

      I used the NGK on a 2017 roushcharged GT. Smooth Idle, great acceleration too!

      Barry

      Year: 2017 Submodel: GT

      Helpful (2)

    • 4/5

      Installation Time: Less than 1 Hour

      May 23, 2018

      Great

      Fit perfect and the car was cutting off and that fixed it

      UsC15

      Year: 2014 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Less than 1 Hour

      May 04, 2018

      Great Plugs

      Installed these in my 2012 F-150 with 5.0. Felt an immediate difference. Smoother idle, better throttle response, can feel the better fuel burn especially in the higher RPMs. I also have the BBK 85mm T/B, Airaid CAI, Freeflow exhaust, headers and 5Star performance SCT with custom tune. With these plugs and my other upgrades I can feel the power gains throughout the entire power band. Very happy with my purchase of these. Will by them again when these are burned out!

      Olebroncbuster55

      Year: 2011 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Less than 1 Hour

      April 24, 2018

      Great

      They were easy to install and you can feel the difference in the spark plugs right away

      JoseA

      Year: 2014 Submodel: GT

      Helpful (2)

    • 5/5

      April 22, 2018

      Exactly what i wanted

      Well packed, little anti seize and installed for more boost.

      NathanH

      Year: 2013 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Afternoon

      April 06, 2018

      Perfect so far for my boost!

      Bought with my supercharger build. The only tough thing I will say is the the passenger side is hard. But the drivers side is easy. Just need a 3/8 spark plug socket and some long and short extensions

      DesmondS

      Year: 2017 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Less than 1 Hour

      February 25, 2018

      Best plugs for Forced Induction!

      I had a set of brisk plugs that came with my supercharger kit but they got fouled quicker than I expected and I developed random misfires. Switched over to these NGK plugs and they've already outlasted my previous set. These were also recommended to me by my tuner and I've heard other tuners recommend the same for FI applications.

      Zain

      Year: 2015 Submodel: GT

      Helpful (3)

    • 5/5

      Installation Time: Less than 1 Hour

      February 10, 2018

      Oh snappy

      Had a little bit of rough idle for awhile put these plugs after reading several forums smooth as a rail now and throttle response is sweet. Be careful disconnecting the coils they are very tight.

      jstang14

      Year: 2014 Submodel: GT

      Helpful (3)

    • 5/5

      Installation Time: Less than 1 Hour

      January 14, 2018

      Tune up

      Install was easy great spark plug.The Coyote 5.0 is an easy engine to tune in your own driveway. Plugs and coil packs are right there with easy reach anyone can do it. With a spark plug socket and an 8mm socket you can make your pony run better than the day you drove it off the car lot for the first time.

      dbradlow

      Year: 2012 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Shop Install

      October 16, 2017

      Connection

      NGK Iridium Spark Plugs was placed in car since I recently installed a Pro charger. The plugs allows the car to run smoother during shifting as well as mid range on the car.

      Tasmania1

      Year: 2013 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Less than 1 Hour

      September 17, 2017

      great for my paxton s550

      great parts. car made 734 to the tire and the plugs were just the thing we needed

      Sloyote

      Year: 2017 Submodel: GT

      Helpful (2)

    • 4/5

      Installation Time: Afternoon

      September 11, 2017

      little more pep

      Gives you a little more pep, if you have the money it makes sense for a quick replacement for higher quality spark plugs

      Willis

      Year: 2015 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Less than 1 Hour

      August 28, 2017

      Good bang for the buck!

      Ngk plugs hold up very well on a supercharged engine. The grade of plug with the right gap makes all the difference in the world

      Carey

      Year: 2012 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Less than 1 Hour

      August 07, 2017

      2015 Mustang gt Hellion twin 55mm turbo

      This NGK (heat range 7) plug works great with Hellion twin system. Along with upgraded coil packs, these plug produce a strong smooth spark at higher rpms.

      MacP

      Year: 2015 Submodel: GT

      Helpful (3)

    • 5/5

      Installation Time: Less than 1 Hour

      July 12, 2017

      Best plugs

      I have used many different plugs over my years but ngk plugs have always been top quality and never had one foul out on me. I had 6509s for n/a when I fouled out Ford oem plugs at 16k miles.. I put these in and what a difference no more miss and my car seemed to idle way smoother even from when it was new. So now I'm with 6510s for my boost build

      bullitt1204

      Year: 2013 Submodel: GT

      Helpful (4)

    • 5/5

      Installation Time: Less than 1 Hour

      June 25, 2017

      WOW

      Huge difference from the stock plug these are a must install ...........................................

      bodyman64

      Year: 2012 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: 0-$100

      June 21, 2017

      Great

      Thanks for a good quality for my supercharged coyote !

      awwwad

      Year: 2015 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Less than 1 Hour

      June 20, 2017

      Boost friendly

      My Tuner recommended these to run with my stage 2 Procharger pushing 10 pounds of boost. Car runs much smoother and has no surge issues at high RPM. A must have for boosted applications.

      DavidB

      Year: 2016 Submodel: GT

      Helpful (5)

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