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NGK Laser Iridium Performance Spark Plugs (11-17 GT; 12-13 BOSS 302)

Item 64062
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$119.99 (set of 8)

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    Features, Video & Details

    • High Performance Replacement
    • Improves Fuel Economy and Lower Emissions
    • Heat Range: 6
    • NGK Part# LTR6BI-13; NGK Stock# 3789
    • 14mm Thread Pattern
    • Sold as a Set of 8
    • Fits 2011-2017 GT and 2012-2013 BOSS Mustangs

    Review & Installation Video

    Review & Install Video

    Hey, everybody. Alex with Today, I'm bringing you my quick review and breakdown of NGK's Laser Iridium spark plugs, fitting your 2011 through 2017 GT and a '12 and '13 Boss 302. So NGK's Laser Iridium performance plugs we're taking a look at today is going to be a great option for any '11 through '17, or Boss 302 owner out there that's looking for a great replacement plug or an upgraded plug, which can range for a stock or a mild bolt-on build.However, I'll throw it out there that if you're running any type of forced induction at all, maybe a small shot of nitrous, I would suggest checking out NGK's 9 Series plugs, as they're going to be a step cooler. I'm going to explain the heat ranges a little bit more, coming up soon. So I will throw it out there that no matter the manufacturer of the spark plug that you're looking at, heat ranges are going to be all over the place. NGK's is a little bit backwards, for lack of a better term or explanation, because the higher the number will yield a cooler plug. But being said, NGK's Iridium plugs that we're taking a look at here today will be a step hotter than the plugs that I have previously mentioned. That nine heat range is going to be great for a forced induction or a car that's running some nitrous. However, these are going to be at a heat range of six, which is going to be perfect for a stock or a mild bolt-on car. Now, by getting into a set of fresh plugs or an upgraded set like we're looking at here today, you're essentially going to be making your Coyote work that much more efficiently. While it's advertised that spark plugs can help your fuel consumption, with a 400-plus horsepower car, it's really not something that you're going to notice just based on how you're driving, as well as the age of the car. Now, the great thing about doing plugs is that they're not going to install with that much effort. For that, we'll be giving them a very easy one out of three wrenches on the difficulty meter, and about an hour for the labor with basic hand tools. Now, in terms of what makes these what these are, or just a spark plug in general, we're going to see that it's going to feature an iridium disk, which is essentially going to be welded on the center electrode, and then a platinum disk which is then going to be welded on the ground electrode. Now, these are going to be one of your more pricier plugs out there, but that's going to be due to the fact that it will be coming with very premium materials. In turn, you should expect to get about 50,000 miles of use out of your plugs. Now, at the end of the day, in English here, guys, what that's going to translate to is going to be a much happier and healthier Coyote, one that's going to heat up a little bit faster. In some instances, you might even see an improved idle and one that's going to be geared towards a stock or a mild bolt-on Coyote. Now, with premium materials and that NGK name, this is not going to be something like you'd find at your local gas station right off the shelf. You should expect to be spending about $115 to get into this set. Now, in my humble opinion, that's a really small price to pay to ensure that your Mustang is going to be running at 100%. Again, I'll throw it out there one last time that when you're shopping for spark plugs, you really need to pay close attention to the manufacturers' heat ranges, because it will change from brand to brand. Now, switching gears to the installation portion of the video. Just like I had said off top, you're looking at a very simple one out of three wrenches on the difficulty meter here, and about an hour's worth of labor, or maybe less if you've pulled your plugs before. But looking ahead, some things I'd make sure to have on hand here would be a basic socket set, a long extension, and then a torque wrench. So I'm Alex and that's my quick review and breakdown of NGK's Laser Iridium spark plugs, fitting your 2011 through 2017 GT, and the '12 and '13 Boss 302, which can be found right here at

    Regular Maintenance. Replacing your old weak spark plugs is paramount to keep your engine running smoothly and efficiently, so why replace them with the same old sub-par stock plugs when high performance plugs from NGK will improve fuel efficiency and lower your emissions.

    Superior Construction. NGK Laser Iridium Performance Spark Plugs feature an iridium disk that is welded on the center electrode and a platinum disk that is welded on the ground electrode to reduce the wear rate of both surfaces ensuring greater durability and longer life. NGK uses pinpoint precision laser welds to reduce excess debris decreasing the required voltage to bridge the spark gap for a more efficient burn.

    Application. This set of eight (8) NGK Laser Iridium Performance Spark Plugs are specifically designed as a direct fit replacement for the 2011 to 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# LTR6BI-13

    CA Residents: WARNING: Cancer and Reproductive Harm -

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

      Customer Photos (5) Submit Your Photo

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        Questions & Answers (31)

        5 Top Rated Questions

        Are these plugs good for a full bolt on mustang gt running on e85?

        • The NGK Laser Iridium Performance Spark Plugs will be the OEM heat range and will work well with most bolt on cars, however without knowing the exact modifications done, it is hard to say what would be the best plug for a given setup.

        Helpful (11)

        what is the Torque on these plugs?

        • These spark plugs would be torqued to 133 (15 Nm). The spark plugs should be installed on an engine that is warm to the touch, but not hot or cold, to prevent damage ti the threads in the head.

        Helpful (5)

        Can you install these spark plugs on a stock 2014 mustang GT?

        • The NGK Laser Iridium Performance Spark Plugs would be directly compatible with your stock 2014 Mustang GT!

        Helpful (4)

        For a 2014 GT... what is the factor set spark plug gap? Also, what gap would be recommended for these new spark plugs to go with my new Pro Street Series High Performance Coil Packs, K N Series 69 Typhoon Cold Air Intake, and my Bama V2 Performance Tune? Thanks!

        • The 2014 OEM gap specs are 0.049"-0.053". We typically recommend gapping them to factory specs, however, since you do have some modifications added we would recommend reaching out to your tuner as they would be able to let you know what your new spark plugs need to be gapped to.

        Helpful (2)

        These spark plugs were replaced by the NGK LTR6BI-13 right? The NGK website says that the stock #3789 are not made anymore.

        • The ILTR6A-13G has been replaced by the LTR6BI-13 plug.

        Helpful (2)
        10 More Questions
        I have a 13 Mustang GT. If I buy new 65,000 volt coil packs, would it be a good idea to get new plugs? If so, are these good ones? Would you recommend another type. If it matters, the car already has CAI, long tubes, cat delete X pipe, resonator delete over axels, and running the Bama 93 octane race tune. 1 answer
        So with a heat range of 6 can i run this plug with e85 or should i go to a 7-9 ? 0 answer
        Do we need to put anti seeze on the plug being that they are being installed into a aluminum head? 1 answer
        Do these come pre-gapped from the factory or do you have to gap them yourself? 1 answer
        Usually how many miles do they last 1 answer
        Will these fit a 2018 GT mustang? 0 answer
        My car has 77k miles and I'm thinking to change out the spark plugs to these NFL laser idioms. Is there any advantage over OEM plugs and since the coil covers for the 2014 are still good should I not worry about changing the coils? Any opinions? Thnx 1 answer
        Does those Spark Plugs also fit to a 16 Mustang GT for Europe? Or are there differences between the european version and the ones for USA/Canada? Thank you! 1 answer
        What should these spark plugs be gabbed at? Should they be the same as the stock spark plugs and? 1 answer
        I have a 2014 mustang gt and I'm going with boss intake manifold bbk LTH with offroad x pipe 47lb injectors and e85 so are these ok for mine ? 1 answer

          Customer Reviews (65) Write a Review

          Ratings Summary

          4.8 out of 5 overall rating from 65 customers

          Installation Time: Less than 1 Hour

          Installation Cost: 0-$100

          • December 31, 2019

            5 2011 GT - Duane Installation Time: Less than 1 Hour

            New plugs

            Great product, gives me piece of mind knowing I have a great set of new spark plugs

            Helpful (0)
          • October 28, 2019

            5 2012 GT - Asal

            Great product

            Brought back lost power instantly on my 2012 GT/cs

            Helpful (0)
          • September 19, 2019

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

            A must have for your coyote

            Increased throttle response and better gas mileage. At 60k all my stock plugs were needing a refresher!

            Helpful (2)
          • June 12, 2019

            5 2014 GT - corkymoore2007 Installation Time: Less than 1 Hour

            Worth the price

            Completely changed how my car runs. Well worth the extra money.

            Helpful (1)
          • May 10, 2019

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

            Perfect plug for NA!

            These Laser Iridiums are the perfect plug for naturally aspirated. Purchased my 2017 Mustang GT Premium Performance Package in Jan 2017. A few days ago it occurred to me that I haven’t changed out the plugs since owning the car! (Ouch)! I’m always on top of things and felt negligent in a major way! I began to research of what plug would best suit my stang and came across the NGK Laser Iridium Premium. Rated @ Heat 6 for Naturally Aspirated. I put the order in! Once, I received them, I couldn’t wait to install and swapped out the old plugs! When finished, I started her up and noticed instantaneously a much more smoother start, idle w/a cleaner tone. I took her for a test drive and definitely noticed a CRISP/CLEAR response! Of course w/the help of 112 octane mix. I would definitely recommend these NGK Laser Iridium plugs that offer a perfect balance to the performance especially when it comes to fuel efficiency! Excellent Plug!

            Helpful (2)
          • May 10, 2019

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

            Nice bang for buck

            These performed so well after removing my old burnt plugs

            Helpful (0)
          • April 17, 2019

            5 2014 GT - Gemar Installation Time: Afternoon

            Great Spark Plugs

            Easy install as they are the same way as the oem plugs. Will say you can defiantly tell you get better response from the car and see improvement in your mpg.

            Helpful (0)
          • April 08, 2019

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

            Good plugs!

            These were a great replacement for the factory plugs i have had no problems with them they fired clean when i installed them. And have improved my fuel effiency by atleast 1 mpg. Not alot but anything helps with these monsterous coyotes!

            Helpful (0)
          • March 04, 2019

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


            Great fit for my mustang. I also installed the Accel Supercoils at the same time. Really improved the performance of my car.

            Helpful (0)
          • February 14, 2019

            5 2016 GT - SteveN Installation Time: Less than 1 Hour

            No problems

            Plugs came pre-gapped, ready to install, as expected. I also replaced the coil packs with new SR Performance packs.

            Helpful (0)
          • February 08, 2019

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

            NGK laser Iridium

            By far the best spark plugs!!! Install was easy and definitely fixed a couple issues I had.

            Helpful (0)
          • February 03, 2019

            5 2011 GT - JonathanD Installation Time: Less than 1 Hour

            NGK Sparkplugs

            Great product! Just what I needed! Highly recommended!

            Helpful (0)
          • January 09, 2019

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


            Recently installed these plugs and some SR performance coil packs before my dyno, and the engine was super smooth, idle was great. Install only took an hour and I wasn’t rushing by any means. I have 127xxx miles, runs like it’s fresh of the assembly line now. Highly recommend doing the coil packs as well if your plugs are due.

            Helpful (4)
          • December 26, 2018

            5 2013 GT - OriD Installation Time: Less than 1 Hour

            Does the job

            I noticed a bit of life and response come back but not major. Good maintence plugs.

            Helpful (1)
          • December 24, 2018

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

            Excellent plugs

            Plugs came gapped at .049 which works great.. only needed to slightly adjust one plug because im a bit ocd like that.. intall went perfect outside of the factory coil pack plugs.. they always suck having to deal with them.. i even replaced my coil packs at the same time with ford performance coil packs.. now i dont have to worry about either for quite a while.. engine fires quickly and purrs like a kitten.. the small amount of idle fluctuation that i had before was eliminated and now idles steady and smoothly..

            Helpful (2)
          • December 10, 2018

            5 2013 GT - JamesB Installation Time: Less than 1 Hour

            NGK Spark Plugs

            Best plugs on the market. Make sure you get the right temparuture plugs. if running Nitrous you'll need a colder plug.

            Helpful (2)
          • November 22, 2018

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

            Got back some lost power

            Swapped my old plugs out for these and can definitely feel a difference in performance. Car pulls much stronger and feels healthier. Great swap for n/a builds with or without e85. For FI, go 1 step cooler.

            Helpful (1)
          • November 11, 2018

            5 2014 GT - DRMolder Installation Time: Afternoon

            Car Runs Great

            Not much to tell. They went in very smoothly. It took about 1.5 hours taking my time. All of them were set to .050" gap I adjusted accordingly. My Mustang started just fine and ran smoothly. I guess I will see long term how they hold up.

            Helpful (1)
          • November 07, 2018

            5 2011 GT - AlexB Installation Time: Less than 1 Hour

            Instant Power

            These plugs are definitely high quality and I can feel the difference.

            Helpful (1)
          • September 14, 2018

            5 2011 GT - nn1993 Installation Time: Less than 1 Hour

            NGK Laser Iridium Performance Spark Plugs

            These went great with my coil packs that I installed. Engine is running in top performance! Great product!

            Helpful (1)

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