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

Item 64064
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$89.99 (set of 8)

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      Review & Installation Video

      Stephanie: Hey guys. Stephanie with, 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

      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation


      • 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


      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


      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (51)

      Write a Review

      Ratings Summary

      4.9 out of 5 overall rating from 51 customers

      Installation Time: Less than 1 Hour

      Installation Cost: 0-$100

      • February 17, 2020

        5 2014 GT - Ulises


        Felt more power and more out of my car great upgrade feeling happy what more parts I’m going get

        Helpful (0)
      • December 06, 2019

        5 2015 GT - BradenJ Installation Time: Afternoon


        Havnt got the chance to put them in yet, but I imagine they will be amazing

        Helpful (0)
      • June 14, 2019

        5 2014 GT - pomyman42 Installation Time: Less than 1 Hour

        Great product!

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

        Helpful (1)
      • May 22, 2019

        5 2015 GT - Mando1190 Installation Time: Less than 1 Hour

        GOOD PLUGS!

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

        Helpful (4)
      • May 19, 2019

        5 2015 GT - MitchellD Installation Time: Less than 1 Hour

        Easy install

        Great for what I need them for and easy to Install

        Helpful (0)
      • May 06, 2019

        5 2012 GT - GlenD Installation Time: Less than 1 Hour

        Restored lost power

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

        Helpful (1)
      • April 23, 2019

        5 2013 GT - Swoodartworks

        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.

        Helpful (0)
      • February 18, 2019

        5 2012 GT - AnthonyS Installation Time: Less than 1 Hour

        Spark plugs

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

        Helpful (0)
      • February 14, 2019

        5 2015 GT - kevinbball Installation Time: Afternoon

        NGK 6510

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

        Helpful (1)
      • January 15, 2019

        5 2017 GT - DN Installation Time: Less than 1 Hour

        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 ;-)

        Helpful (3)

      Questions & Answers (22 answers)

      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 (5)

      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)

      Are these spark plugs good for a stock 2013 mustang gt? Are they pre-gapped? If not, what is the gap i need to use? How much torque is recommended to put on the new spark plugs? Thanks a lot.

      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)
      10 More Questions
      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? 1 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

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (8) Spark Plugs

      Tech Specs

      Will It Fit My Mustang

      • Boss 302 - 12, 13
      • GT - 11, 12, 13, 14, 15, 16, 17

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