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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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      Review & Installation 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

      Product Information

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


      • 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


      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

      NGK LTR6BI-13

      CA Residents: WARNING: Cancer and Reproductive Harm -

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (8) Spark Plugs

      Tech Specs


      Customer Reviews (69)

      Write a Review

      Ratings Summary

      4.9 out of 5 overall rating from 69 customers

      Installation Time: Less than 1 Hour

      Installation Cost: 0-$100

      • April 29, 2020

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

        NGK LASER IRIDIUM spark plugs..

        Amazing plugs, feels like power was restored immediately.. Thanks for the fast shipping as well AmericanMuscle !

        Helpful (0)
      • April 03, 2020

        5 2015 GT - MikeH Installation Time: Afternoon



        Helpful (0)
      • March 28, 2020

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

        Great product

        Amazing quality . 1 hour install, car feels different when turning the ignition on

        Helpful (0)
      • March 02, 2020

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

        Great set of spark plugs

        Easy to install pre gapped made it even easier it was pretty fast to install in my 13 gt

        Helpful (0)
      • 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 (5)
      • 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)

      Questions & Answers (33 answers)

      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 (13)

      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 (6)

      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 (6)

      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
      Would these be compatible with my mustang GT 2017 , currently running a 93 Lund tune , catless headers , mbrp axle back muffler delete and a pmas 120MM intake. I also am planning on going e85 soon. 1 answer
      I have a 2015 GT with catback, CAÍ and a tune. Currently have oem spark plugs. If I replace them with these, is it required to get a tune again, or can I just put these in and be good to go ? 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

      Will It Fit My Mustang

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

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