(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
These are the NGK iridium spark plugs for mid-2008 to 2010 GT and Bullet Mustangs. These NGK iridium spark plugs have a heat range of six, which is the same heat range of the factory plugs. Now being the same heat range means that these plugs are gonna be a good option for those that have a stock setup or one with basic bolt-ons. If you have a forced induction Coyote, you'll need to make sure that you go with a colder heat range plug. So, a turbo, super charger, nitrous build would need the step cooler plug. But if you have a naturally aspirated build and you're looking for a performance plug, I would suggest these plugs, since they have the same heat range and these are a good stock replacement upgrade. I will say though, that these are for the Mustangs that are equipped with the brown coil boots only. The install for spark plugs is very easy on the Coyote. It's a one outta three wrenches in the difficulty meter, and you can plan on spending about a half an hour's time. So, heat range is something that's important to pay attention to when you're shopping for spark plugs. Different builds and setups require different heat ranges. It all depends on your mod list. The heat range of the plug is a range where the plug works well thermally. And of course your modifications, or lack thereof, will determine the temperature where the spark plug will be operating. You wanna 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 on this plug is a six, and the way NGK labels their plugs is 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 very high melting point which makes it perfect for performance-based applications. The core in the iridium tip are gonna be determining factors of the heat range of the plug. When it comes to price, you can expect to pay just south of the 100 dollar mark for a set of eight plugs. This is the same as what you can expect to pay for other brands of plugs, so I wouldn't say that the price is crazy here. Your other options include: Ford Performance, Autolite, Ford Motorcraft and Brisk makes an offering for boost that are also very close in price. So the NGK here isn't your only option, but they are your only option if you're specifically looking for an iridium plug. As far as the install goes, this is an easy install and it's a one outta three wrenches in the difficulty meter. You'll 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 putting some anti-sieze on the threads of the new spark plugs and make sure the plugs are all gapped the same before you install them. Once you've swapped all of the plugs, reinstall the coil packs, plug them back in, and that's all it's gonna take. Wrapping things up here, these are the NGK iridium spark plugs for mid-2008 to 2010 GT and Bullet Mustangs. 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
Fitment: 2008 2009 2010 Details
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November 03, 2019
Better than OEM
About to hit 60k so I decided to do this and the fuel filter. I'm lucky to have a 2009 with one piece plugs so no issues breaking. After these and the filter, the car is more responsive, better idle, and no sluggish, dragging feeling I was starting to notice. Nice and peppy now.Helpful (0)
October 23, 2019
Great spark plugs very easy install, already gap to specs, definitely recommended to anyone looking for a good spark plugsHelpful (0)
October 19, 2019
Great but don’t fit the older 4.6
Ok so I got these but no go had to send back and never got refunded for them but it’s cool should have read more they only fit the new 4.6 but no big dealHelpful (0)
August 29, 2019
NGK Iridium IX plugs
I have the thumper cams and it was time for a tune up. The motorcraft plugs were out of stock everywhere and wanted to do tune up right away so went with Iridium plugs. Not disappointed. I wouldn’t say I gained horsepower but that it restored horsepower that I didn’t realize I had lost. I could feel it immediately. Car idles great and cold starts reach smooth idle much faster. I would buy them again.Helpful (0)
March 08, 2019
Great product. Improved the idle and performance. I would recommend these plugs!Helpful (4)
January 17, 2019
I gave these a try since it has a really good reviews. Didn't disappoint.Helpful (1)
November 19, 2018
150,000 miles and still going strong!
They are plugs. I also did msd coil packs. between the two the car is running much better.Helpful (1)
September 24, 2018
excellent product for the price.
as said in the title, good stuff you can't beat the price.Helpful (4)
August 13, 2018
Excellent spark plugs. Best bang for your buck.
Spark plugs feel and look like good quality. Car runs Awsome.Helpful (5)
August 08, 2018
It was perfect on my end. Everything for just wellHelpful (3)
What is a Brown Coil Boot? I see that I must have it to install these plugs so what are they? I have a 2010 GT
The boot coil color changed some time in 2008 from black to brown. Your 2010 would have a brown boot. Hope this helps!
it says to drop 1 heat range for every 75-100 hp added. what is the factory heat range?
The NGK Iridium IX Performance Spark Plugs would share the same heat range of the OEM plugs, coming in at heat range 6.
Is the gap of these NGK plugs set to 0.40-0.50? It seems like a lot of people have installed their new NGK plugs without checking the gap but have had no problems.
We do not have the spec at what these NGK plugs are set to out of the box, they would be close to factory spec but we always recommend double checking the plug gap before installation to ensure proper performance.
So i recently bought an 07 GT/CS 4.6L 3v, The car did not come stock, i popped the hood and reviled the fact that the 4.6 was equipped with a full set of the MSD Blaster pack on plug coil packs, I have no clue if these plugs will work because i have never seen the original boot or coils, will they fit?, The reason i ask is mainly because i am replacing my plugs and possibly my packs as well, due to miss-firing in cylinder 3 and another random cylinder as the dealers told me after a diagnostic, the car also has high flow cats and JBA headers not sure if they are longs or shorts tho, i noticed the problem after my first test drive and usually happens only on full throttle, i was running 93octane pump gas and using 112 octone booster when it started getting really bad.
Your 07 would utilize the of-early 08 style plug design. The only year where the color of the coil boots would need to be checked would be a 2008 model year car.
Will the NGK Iridium plugs work with MSD coil plug set? Will these plugs work with MSD coil plug set?
Yes it will
The NGK Iridium IX Performance Spark Plugs can be used on low boost applications but are not manufactured to be used specifically with forced induction application.
The NGK Iridium IX Performance Spark Plugs will not fit the 2006 Gt. These are designed for 2008-2010 GT and Bullitt Mustangs w/ Brown Coil Boots. We do have spark plugs that will fit your 2006 GT. I will provide the link below. I would recommend anything that will fit from a 05-08 Gt. https://www.americanmuscle.com/mustang-spark-plugs-0510.html#shop-by1
These NGK Iridium IX Performance Spark Plugs are a one piece design.
The NGK Iridium IX Performance Spark Plugs will only fit mid 08-10 GTs.
The NGK Iridium IX Performance Spark Plugs will only fit a mid 08-10 GT
I do not believe these are pre-gapped, however, we recommend gapping the spark plugs whether they're supposed to come gapped or not.
Hi, No tune is required for a set of spark plugs & coils.
With the MSD coil packs you can use either the factory plugs, but if you did want to upgrade your spark plugs these would be the best options for your vehicle.
These are not designed to work for an 07, we have other sparkplugs that are designed for the 07, just no NGK's.
I recommend going with the Ford Racing 0-Degree Spark Plugs (08-10 GT), item # 50373, (http://www.americanmuscle.com/frpp-12mm-sparkplugs-0810gt.html) if you're looking to add Nitrous to your car. These 0-Degree Spark Plugs are perfect for any Nitrous or Force Inducted Engines. Since you have a very specific build, please get in contact with one of our Mustang Experts directly by following the link below, so that we can get you all the right parts for your Mustang! http://www.americanmuscle.com/contact.html
(approx) 2 Hours
Light to Moderate mechanical skill required.
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