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NGK Iridium IX Spark Plugs (94-97 V6; 05-10 V6)

Item 64056
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      Review & Installation Video

      So NGK's Laser Iridium plugs we've got here today are going to be a great option for any of my V6 owners out there that are looking to replace their factory plugs or get into a set of upgraded plugs that are going to help with throttle response and fuel consumption. But not really something that's going to be saving so much money at the pump. NGK's Iridium plugs should also appeal to the owner out there that might be in the process or has already started to do some [inaudible] emission parts. That could be anything from plug wires to coil packs, as everything is going to work hand in hand together. Now, I say that because we've got a lot of V6 customers here that have installed these plugs with some of the aforementioned parts, like coil packs or plug wires. We've heard and you can see it for yourself, the feedback on the product page. You'll see that much more improved throttle response and even, in some instances, smoothing out rough idles. Install-wise, expect an easy one out of three wrenches on the difficulty meter here, and about an hour's worth of wrenching. Now, I do want to mention, when you're shopping for spark plugs, it's really a good idea to pay very close attention to the heat ranges, as they are going to differ from manufacturer to manufacturer. NGK's Iridiums are going to have a heat range of five here. Again, I hate to repeat myself, but it's critical that you pay attention to the heat ranges, because they are going to differ on how hot or cold they are from different manufacturers. Now, I say that, because there's different plugs out there that will exhibit cooler plugs. Pulstar, for example, is going to be a great option for a heavily modified V6, maybe one that has a turbo or a Supercharger on it. So if you're not too familiar with the makeup of a spark plug itself, this is going to feature a copper core electrode, and then the tip itself is going to be iridium. Now, additionally, this is going to feature some trivalent metal plating to ensure that this is not going to corrode and it's going to give you a long-lasting life. Now, at the end of the day, guys, what this all translates to is going to be a much happier and healthier V6, one that's going to heat up faster, you might see some rough idle issues go away, and again one that's going to be a factory upgrade. Price-wise, expect to be spending about $70, which will make these one of the more expensive options out there. You need to take into consideration that NGK has been around for quite some time. You can do a ton of homework on their plugs. But on the flipside here, if you compare that to running down to your local dealer, I probably almost guarantee you that replacing your plugs there are going to run that much more. Installation-wise, you're looking at a pretty easy one out of three wrenches on my difficulty meter here, and about an hour's worth of labor. I will mention, you're going to need a basic socket set, an extension, and a torque wrench. This is a simple spark plug replacement job. You're not looking at anything too hairy here. About an hour's worth of labor, and again a very easy one out of three wrenches on our difficulty meter here. So that'll wrap things up with NGK's IX Iridium plugs, fitting the '05 through '10 and '94 through '97 V6, which can be found right here at

      Product Information

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


      • Iridium Tip for a Constant Stable Spark
      • Improves Fuel Economy and Lower Emissions
      • Heat Range: 5
      • NGK Part# 7316
      • Fits 05-10 V6 and 94-97 V6 Mustangs
      • Sold as a Set of 6


      High Performance. Keeping your Mustang's high performance engine running smoothly and efficiently is important. You should 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 its extremely high melting point, perfect for keeping your Mustang's high-performance engine running at its peak. As an added bonus, the Iridium IX plug features Trivalent Metal Plating for its superior anti-corrosion and anti-seizing properties.

      Application. This set of six (6) NGK Iridium IX Spark Plugs are specifically designed as a direct fit replacement for the 2005-2010 V6 and 1994-1997 V6 Mustangs.

      Fitment: 1994 1995 1996 1997 2005 2006 2007 2008 2009 2010 Details

      MPN# 7316

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (76)

      Write a Review

      Ratings Summary

      4.9 out of 5 overall rating from 76 customers

      Installation Time: Afternoon

      Installation Cost: 0-$100

      • March 04, 2020

        4 2007 V6 - Theboardrider Installation Time: Afternoon

        Good Stuff

        Everything was great, other than the torque wrench which broke first use. But that’s what I get for paying under $30

        Helpful (0)
      • May 15, 2019

        5 2008 V6 - PONY Installation Time: Less than 1 Hour

        New plugs

        Vehicle had a vibration while idleing to include driving on highway. Change to these plugs and engine is running great again.

        Helpful (0)
      • May 09, 2019

        5 2007 V6 - DennisS Installation Time: Afternoon

        New spark

        It's been years since New plugs where installed responds quick again

        Helpful (0)
      • April 03, 2019

        5 2009 V6 - JohnH Installation Time: Less than 1 Hour

        Pricey, but work as intended

        They are a little pricey, but they do what they're supposed to. Don't see any difference in my start-up.

        Helpful (0)
      • February 09, 2019

        5 2008 V6 - Matthew Installation Time: Less than 1 Hour

        Great Upgrade!

        January 2019 replaced the stock plugs on my 2008 V6 convertible @23,000 miles with an upgraded (Accel Super EDIS) coil pack and new 10mm wires. Smoother idle, faster acceleration and to my surprise the throttle lag is all but gone. Its not a V8, but I enjoy the extra HP!

        Helpful (1)
      • December 04, 2018

        3 2006 V6 - LyndaB Installation Time: Afternoon

        May have got a bad plug

        I am sure the plugs are good, but I hade one that seemed like the threads were not cut right. No Problems yet but worries me. The packing was awful, they were just thrown in a big box and allowed to roll around (that may have damaged the threads too). More upset at the lousy packing job the shipping department did. these and other ignition parts just sloshing around in the box.

        Helpful (4)
      • November 12, 2018

        5 2009 V6 - Hugh

        Spark plug review

        Changed plugs, wires and coil. gas mpg went up by 2.5 to 3 per gallon.

        Helpful (2)
      • August 26, 2018

        5 2005 V6 - KeletieK Installation Time: Less than 1 Hour

        Feel the power

        I really feel the power, my mustang so freaking fast ,engine running smoothly, I will like to recommend this spark plug,best spark plug I ever put on my engine, thank to American muscle.

        Helpful (4)
      • August 14, 2018

        5 2007 V6 - BrandonZ Installation Time: Afternoon


        My car has Sure woken up with this install there’s no hesitation anymore quick install recommend it

        Helpful (1)
      • July 23, 2018

        5 2005 V6 - RussS Installation Time: Less than 1 Hour

        Nice Plugs

        Haven't had in long but the 05 feels like it has more power and response.

        Helpful (3)

      Questions & Answers (18 answers)

      5 Top Rated Questions

      gap What is the recommended gap for these spark plugs

      • Read the sticker under your hood. Just about every car has one that tells you the spark plug gap size. If you are running a modified engine set up then the gap sizes can change and your performance part dealer should be able to advise you correctly.

      Helpful (4) Show 2 more answers

      Does anyone know if these plugs come pre-gapped. I remember the manual saying somewhere between 0.052 - 0.054 for the gap.

      • These plugs will come pre-gapped to the stock specifications.

      Helpful (2) Show 1 more answer

      I purchased a set of iridium plugs, 10 mm wires, and a screamin demon coil pack. The wire manufacturer recommends that the plugs be gapped to .065 while the manual recommends .053. Since the new wires are larger and not stock, I would think that the wire manufacturer's advice should be followed. Is this true? Thank you.

      • I would follow the manufacture's advice when it comes to setting the plugs gap.

      Helpful (1)

      Is it necessary to use anti seize and dielectric grease on these? I have heard anti seize compound on the threads and dielectric grease on the electrode is a good idea. Is it really necessary to use these products on these plugs?

      • It isn't necessary, per se, but it is recommended. The anti-seize on the threads will keep the plug from galling or seizing in the head and make them easier to service in the future. The dielectric grease will help keep dirt and water/moisture out which help deter moisture intrusion, or corrosion, that can cause misfires. Both are inexpensive insurance to make sure that future tune-ups are easier and more straight forward.

      Helpful (1) Show 3 more answers

      Plugs and wires Can I use these plugs with 10 mm Live Wires ?

      • Yes plug wires have no Bering on the type of plug u use but most of the time platinum and iridium are the better plugs

      Helpful (1) Show 2 more answers
      Post Your Question
      10 More Questions
      Will these handle a 100 shot of nitrous on a 2007 v6 1 answer
      Hey I have a 93 race BAMA tune, CAI, throttle body spacer, and 10mm performance wires. What gap do you think I need for best performance? 1 answer
      Do I have to disconnect the battery to reset the ECU after installing iridium spark plugs? 1 answer
      Can I use these spark plugs with 87 octane, or do they need higher octane? 1 answer
      With a 2009 V6 auto, mods include CAI and BAMA tune, screamin demon coil and 8mm wires, throttle spacer (not a larger throtlle body)4,11 gears and a 4inch 1-piece aluminum drive shaft... what's the best gap for these plus now that car isn't 'stock'? 1 answer
      Will these be ok for a 75 shot of nitrous? 1 answer
      Any noticeable gain in power for the 4L V6? Or sound? does it have quicker responsiveness? 1 answer
      I am installing these spark plugs along with the screaming demon coil. I see many customers say to gap these at .065, does this make a real difference? 1 answer
      I am running almost a stock setup. Only modification is CAI, Accel Coil Pack, and Taylor 8 mm live wires . As the heat range on these plugs are one step colder than stock will this plug hamper my engine and its performance. Seems like these are good match for highly modified engines ??? 1 answer
      Is a tune required after installing these? 1 answer

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (6) Spark Plugs

      Tech Specs

      Will It Fit My Mustang

      • V6 - 94, 95, 96, 97, 05, 06, 07, 08, 09, 10

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