(approx) 2 Hours
Light to Moderate mechanical skill required.
- Customer Submitted:
- How to install Ford Motorcraft OEM Spark Plugs on your 2008-2010 GT Mustang
$89.99 (set of 8)FREE Shipping
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.
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Features, Description, Reviews, Q&A, Specs & Installation
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February 17, 2020
Felt more power and more out of my car great upgrade feeling happy what more parts I’m going getHelpful (0)
December 06, 2019
Havnt got the chance to put them in yet, but I imagine they will be amazingHelpful (0)
June 14, 2019
My old plugs were very bad and these helped wake the car right back up!Helpful (1)
May 22, 2019
Have them on my 2015 GT N/A just a quick gap change and boom.Helpful (4)
May 19, 2019
Great for what I need them for and easy to InstallHelpful (0)
May 06, 2019
Restored lost power
Mustang was feeling a bit sluggish. These plugs fixed that problem.Helpful (1)
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.Helpful (0)
February 18, 2019
Took maybe 30 min to get everything in and out very easy taskHelpful (0)
February 14, 2019
Best plug for forced induction applications! I have gotten good life out of the NGK plugs.Helpful (1)
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 ;-)Helpful (3)
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.
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.
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.
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.
Unless you are heavily modified or boosted, your best bet is going with stock replacements.
We would recommend checking with your tuner or with VMP directly.
We would not recommend these plugs for your setup.
We cannot confirm fitment for these plugs in a 15 Ecoboost. These are pre-gapped.
Yes, these spark plugs are pre-gapped at the factory specs. We would recommend speaking with your tuner regarding you gap specifications as you would need to adjustit before these are installed.
Using E85 will not require new spark plugs. Generally for every 75-100hp you add, you will want to get a spark plug 1 heat range colder.
The Ford Performance Part number M-12405-M50A (https://www.americanmuscle.com/ford-performance-spark-plugs-1117-gt.html) are similar to the NGK Iridium IX Performance Spark Plugs - Heat Range 7- both feature an Iridium Tip and a Heat Range of 7. Ford Performance spark plugs are made from Motorcraft though, not NGK.
These NGK Iridium IX Performance Spark Plugs can be used without nitrous as long as they are gapped properly.
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 induction engines. However I would recommend the NGK Laser Iridium Performance Spark Plugs I have provided a link below. https://www.americanmuscle.com/ngk-iridium-3789.html
The NGK Iridium IX Performance Spark Plugs - Heat Range 7 will work when you are not at the track as long as they are gapped accordingly.
(approx) 2 Hours
Light to Moderate mechanical skill required.
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