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

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

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  • Item 64064

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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

    MPN#6510

    more

    CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

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

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        Questions & Answers (22)

        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 (4)

        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 (3)

        I have a 2015 mustang GT with a stage 1 roush supercharger. What do you guys suggest tapping them at and what are these plugs gapped at out of the box? *without asking a tuner*

        • It will honestly depend on your build. We recommend checking with either Roush or your tuner to confirm what would work best for your specific setup.

        Helpful (0)

        I have a stock 5.0 2011 will these spark plugs work dont have nothing in it but a roush cold air intake in it

        • 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. We would not recommend using these plugs with a 5.0 motor that is only equipped with a cold air intake.

        Helpful (0)

        I have mild bolt on modifications on my 2014 mustang gt, but I plan to add some more modifications such as upgraded exhaust and a 302 manifold. what heat range do you think would be best for my mustang?

        • Unless you are heavily modified or boosted, your best bet is going with stock replacements.

        Helpful (0)
        Post Your Question
        10 More Questions
        Recommend gap for tuned procharged 2012 5.0 0 answer
        Hi I have a 2015 50th year anniversary Mustang Gt 5.0 with a VMP supercharger are these spark plugs the right ones for it? 1 answer
        I have bolt ons and run E85 on my 2014 GT, would these spark plugs run good on my car? Being that the heat range is 7 and all 1 answer
        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? 1 answer
        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. 1 answer
        Hello, is there a specific type of spark plug that would be recommended for e85 fuel? 1 answer
        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

          Customer Reviews (49) Write a Review

          Overall Rating 4.9

          out of 5 stars

          Installation Time:Less than 1 Hour

          Installation Cost:0-$100

          • Performance Gain 4.5625 4.6
          • Fit 4.979167 5.0



          • 5/5

            Installation Time: Less than 1 Hour

            June 14, 2019

            Great product!

            My old plugs were very bad and these helped wake the car right back up!

            pomyman42

            Year: 2014 Submodel: GT

            Helpful (0)

          • 5/5

            Installation Time: Less than 1 Hour

            May 22, 2019

            GOOD PLUGS!

            Have them on my 2015 GT N/A just a quick gap change and boom.

            Mando1190

            Year: 2015 Submodel: GT

            Helpful (2)

          • 5/5

            Installation Time: Less than 1 Hour

            May 19, 2019

            Easy install

            Great for what I need them for and easy to Install

            MitchellD

            Year: 2015 Submodel: GT

            Helpful (0)

          • 5/5

            Installation Time: Less than 1 Hour

            May 06, 2019

            Restored lost power

            Mustang was feeling a bit sluggish. These plugs fixed that problem.

            GlenD

            Year: 2012 Submodel: GT

            Helpful (0)

          • 5/5

            April 23, 2019

            Fits the bill

            These are the plugs recommended by Kenne Bell to use on my Mustang GT equipped with their 2.8lc Supercharger, and getting them from a company I trust and have spent thousands of dollars with modifying my Mustang GT keeps my mind at ease, and the specific NGK plugs I need are hard to find locally.

            Swoodartworks

            Year: 2013 Submodel: GT

            Helpful (0)

          • 5/5

            Installation Time: Less than 1 Hour

            February 18, 2019

            Spark plugs

            Took maybe 30 min to get everything in and out very easy task

            AnthonyS

            Year: 2012 Submodel: GT

            Helpful (0)

          • 5/5

            Installation Time: Afternoon

            February 14, 2019

            NGK 6510

            Best plug for forced induction applications! I have gotten good life out of the NGK plugs.

            kevinbball

            Year: 2015 Submodel: GT

            Helpful (0)

          • 5/5

            Installation Time: Less than 1 Hour

            January 15, 2019

            Work well with supercharger

            Well made- no bubbles or runs. Packaged individually with thread protectors. Iridium coating is smooth and sturdy-doesn't flake off when u gap them. Make sure you have a rubber tube insert in your socket when u take out / install... that's a deep hole ;-)

            DN

            Year: 2017 Submodel: GT

            Helpful (2)

          • 5/5

            Installation Time: Less than 1 Hour

            January 11, 2019

            Great Product

            Solid product. Good quality. Easy to set the gap. Good to know they are good for nonboosted engines as well as boosted. Just need to change the gap.

            Adora

            Year: 2014 Submodel: GT

            Helpful (1)

          • 5/5

            Installation Time: Less than 1 Hour

            December 06, 2018

            NGK PERFORMACE PLUGS

            Very easy to install. Marked difference in my performance. Feels like I'm in sport mode. A great first upgrade.

            Cliff

            Year: 2017 Submodel: GT

            Helpful (1)

          • 4/5

            Installation Time: Less than 1 Hour

            November 22, 2018

            Plugs are great.

            Heat range 7 is great for higher performance engines. If AM starts selling the heat range 9 I suggest you get them for forced induction.

            NathanL

            Year: 2015 Submodel: GT

            Helpful (1)

          • 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 (2)

          • 4/5

            July 20, 2018

            Great plugz

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

            ErnestoR

            Year: 2011 Submodel: GT

            Helpful (3)

          • 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 (3)

          • 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 (2)

          • 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)

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