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

Market Price $99.99 You Save 10% ($10.00)
Our Price

$89.99 (set of 8)

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  • Item 64064
  • MPN#6510

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Features & 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
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

What's in the Box
  • (8) Spark Plugs
Installation Info
Tech Specs
Will it fit my Mustang?
  • Boss 302 - 12, 13
  • GT - 11, 12, 13, 14, 15, 16, 17

People Who Bought This Item Also Bought

Most Helpful Reviews

5/5
Great product!!

Great product. They fit perfectly. I even noticed my spark advance was more stable at idle. I watched my Ngauge and it usually would bounce all around and now it says pretty consistent. No a hard install ...

Read More
Helpful (1)

5/5
NGK Iridium spark plugs

Happy with the plugs but could not find the proper gap until I called American Muscle. FYI: it's .048-.052. Changed the plugs at 59,500 miles and I am happy with a noticeable improvement in performanc ...

Read More
Helpful (1)

Overall Rating 5 out of 5 stars
Read All 16 Reviews

Customer Photos

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5 Questions / 5 Answers

Ask a Question

What is the recommended gap for these with a bolt on 2012 GT?

Manny0291

Helpful (0)
  • I recommend using the stock gap for these which is .050 for naturally aspirated cars.

    KevinD92

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?

Anonymous

Helpful (0)
  • if you're not using forced induction or nitro, then these are not the right spark plugs for you, these are one step colder than your factory spark plugs

    Nuacros

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

HighSpeed77

Helpful (0)
  • The firing order for a new 5.0 engine is 1-5-4-8-6-3-7-2.

    AshleyK

is it necessary to change the coils after changing the spark plugs?

MustangOwner

Helpful (0)
  • It is not necessary to change the coils, but it isn't a bad idea either.

    JeffAM

What is the difference between this one and the NGK laser spark plugs? Thanks

Kem

Helpful (0)
  • The NGK Iridium IX Performance Spark Plugs have a heat range of 7 and are perfect for nitrous and forced induction engines. The NGK Laser Iridium Performance Spark Plugs (11-17 GT; 12-13 Boss), item # 64062, (http://www.americanmuscle.com/ngk-iridium-3789.html) have a heat range of 6 and are considered to be a high performance replacement. If you have minor bolt ons and modifications done to your car, the NGK Laser Spark Plugs will be perfect for you.

    AshleyK

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Customer Reviews (16) Write a Review

Overall Rating 5.0

out of 5 stars

Installation Time:Less than 1 Hour

  • Performance Gain 4.5 4.5
  • Fit 4.9375 4.9



  • 5/5

    Installation Time: Less than 1 Hour

    January 31, 2017

    Installed with Paxton Supercharger Kit

    I bought these to be used with my Paxton supercharger kit w/ a 3.6" pulley since a heat range one step colder than stock was recommended. I gapped them at .032 and after the installation was completed, the car fired up on the first try. The idle is good and so far everything seems great. These fit the exact same as the stock spark plugs, no issues at all.

    dsp4848

    Year: 2015 Submodel: GT

    Helpful (1)

  • 5/5

    Installation Time: Afternoon

    November 15, 2016

    2016 mustang gt plugs

    really easy install minus the passenger rear one was a little tricky to get out.

    woolyyfiveo

    Year: 2016 Submodel: GT

    Helpful (1)

  • 5/5

    Installation Time: Less than 1 Hour

    June 03, 2016

    Great product!!

    Great product. They fit perfectly. I even noticed my spark advance was more stable at idle. I watched my Ngauge and it usually would bounce all around and now it says pretty consistent. No a hard install at all. Took me a minute to figure out how to unplug the coil packs but after that it was a breeze. And one of my cool packs wouldn't come unplugged so I carefully just pulled the coil out without damaging the wiring in the process. But as far as removing and replacing the plugs it's a simple task (using a 5/8 spark plug socket) idk why the instructions say 9/16. Also the bolts that hold down the coil packs are 8mm not 7mm. Aside from all the these are a great product and work well with any application. I got them for Nitrous. But they work well with boost as wel.

    Kyler

    Year: 2014 Submodel: GT

    Helpful (1)

  • 5/5

    Installation Time: Afternoon

    April 26, 2016

    NGK Iridium spark plugs

    Happy with the plugs but could not find the proper gap until I called American Muscle. FYI: it's .048-.052. Changed the plugs at 59,500 miles and I am happy with a noticeable improvement in performance.

    2013GT

    Year: 2013 Submodel: GT

    Helpful (1)

  • 5/5

    Installation Time: Afternoon

    April 24, 2016

    Great plugs

    Included in the Edelbrock/Brenspeed blower kits. They work great for boosted motors.

    Melmark93

    Year: 2013 Submodel: GT

    Helpful (1)

  • 5/5

    Installation Time: Less than 1 Hour

    December 23, 2014

    Essential for boost

    If you plan on supercharging or going forced induction the colder range plugs is a must and ngk is the way to go was recommended by my tuner (jpc).I highly suggest talking to your tuner for gap size but I've always set them at .030 - .033 , these plugs eliminate spark blow out with the proper gap size under boost

    Anonymous

    Year: 2012 Submodel: GT Fort Meade, MD, USA

    Helpful (1)

  • 5/5

    Installation Time: Less than 1 Hour

    August 12, 2014

    Best Plugs

    Best spark plug set up for Supercharged applications!

    Dan19

    Year: 2011 Submodel: GT Springfield , pA

    Helpful (1)

  • 5/5

    Installation Time: Less than 1 Hour

    July 22, 2014

    Great Plugs for the price

    I have a 2012 RS3 so the gap was incorrect, but once I adjusted the gap to .032" the install took less than an hour. The 5.0 is easy to replace plugs. Roush runs strong and hoping to get better gas mileage. These are great plugs for the price. AM is the cheapest I found.

    wrhecksher3

    Year: 2012 Submodel: Other Tampa, FL, USA

    Helpful (1)

  • 5/5

    Installation Time: Afternoon

    June 20, 2014

    Great torque gain !

    I installed these NGK spark plugs on my 2012 mustang gt at 50,000 miles replaced the stock motorcraft spark plugs after installing them I got in the car and took the car for a test drive after driving for a couple miles I could feel how I had instant torque when I wanted I could really feel the difference in power which is what I wanted to feel after installing them. The installation was fast and easy !

    Rickydog13

    Year: 2012 Submodel: GT Los Angeles, CA, USA

    Helpful (1)

  • 5/5

    Installation Time: Less than 1 Hour

    June 04, 2014

    great for forced induction

    weather you are running a Turbo,supercharger, nitrous or some kind of crazy combination of either, these are a great plug to keep things safe.

    LOUISSIUOL

    Year: 2011 Submodel: GT pa

    Helpful (1)

  • 5/5

    Installation Time: Less than 1 Hour

    April 22, 2014

    great features, smooth ride and saves on gas

    really pleased with the spark plugs, a buddy put some on his 2012 Shelby and i ordered some the next day

    Adam36

    Year: 2014 Submodel: GT

    Helpful (1)

  • 5/5

    Installation Time: Less than 1 Hour

    October 23, 2013

    Forced Induction NGK plugs

    I was running Ford's-Motorcraft one heat range colder on my VMP-TVS blower installation when I developed a small idle hesitation, so Justin recommended going for the NGK's... perfect, the idling issue went away, no problems pushing 10 lbs. of boost at 7k rpms plus with these plugs! Thanks AM!!!

    sportys1

    Year: 2012 Submodel: GT Puerto Rico

    Helpful (1)

  • 5/5

    Installation Time: Less than 1 Hour

    May 22, 2013

    Easy as Changing a Spark Plug

    Not sure what if any HP gain you get, but it definitely responds better than the stock plugs. I recently installed these when I installed the Accel Coil On Plug Kit and you can certainly tell a difference in the response. I have no complaints.

    WolfstangKahlan5Oh

    Year: 2011 Submodel: GT Warrensburg, MO

    Helpful (1)

  • 5/5

    Installation Time: Less than 1 Hour

    August 22, 2014

    Street and Strip

    I am running a 75 shot of nitrous with these plugs. My car runs smooth while running nitrous and without it! I highly recommend these plugs!

    Jameson100

    Year: 2012 Submodel: GT Roosevelt, UT 84066, USA

    Helpful (0)

  • 5/5

    Installation Time: Less than 1 Hour

    July 04, 2014

    NGK Iridium IX Performance Spark Plugs

    Install was easy - Felt a better response than the OEM plugs. Trottle response was also better. Engine ran smoother. No gain in mileage that I can see, but to be fair - I haven't driven the car long distance to really notice. Overall - I would say these plugs are worth the purchase and install. My mustang is running better!

    STANGBOSS

    Year: 2012 Submodel: GT Fleming Island, Florida

    Helpful (0)

  • 5/5

    Installation Time: Less than 1 Hour

    May 16, 2016

    Great upgrade!

    Excellent product! All came pre gapped to 0.040 which is great for naturally aspirated engines and easily gapped to a lower spacing for forced induction engines.

    JSpencer

    Year: 2014 Submodel: GT

    Helpful (0)

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