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NGK Iridium IX Performance Spark Plugs (93-01 Cobra; 96-04 GT, Mach1; 98-04 V6)

61 Reviews
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(set of 8)
  • Item #64007
  • MPN# 7164

  • Market Price $79.99
  • You Save 13% ($10.00)
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  • Iridium Tip for a Constant Stable Spark
  • Improves Fuel Economy and Lower Emissions
  • Heat Range: 5
  • NGK Part# 7164
  • Fits 93-01 Cobra, 03-04 Mach 1, 96-04 GT/Bullitt and the 98-04 V6 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) NGK Iridium IX Performance Spark Plugs are specifically designed as a direct fit replacement for the 1993-2001 SVT Cobra, 2003-2004 Mach 1, 1996-2004 GT/Bullitt and the 1998-2004 V6 Mustangs.

Fitment: 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 Details

What's in the Box
  • (8) Spark Plugs
Installation Info
Will it fit my Mustang?
  • Bullitt - 01
  • Foxbody - 93
  • Mach 1 - 03, 04
  • V6 - 98, 99, 00, 01, 02, 03, 04
  • Cobra - 94, 95, 96, 97, 98, 99, 01
  • GT - 96, 97, 98, 99, 00, 01, 02, 03, 04

Most Helpful Reviews

High quality, perfect.

These plugs are very high quality. Replaced my ford motorcraft plugs and felt/noticed a small difference. Runs smooth, idles great, accelerates better w/o hesitation. No change in gas milage however. They ...

Read More
Helpful (2)

a nice upgrade

Together w/ screamin' demons coil packs and ford racing 9mm high performance spiral wires, my stangs fuel mileage seems to have improved. Didnt really feel a power difference and a week later my alternator ...

Read More
Helpful (1)

Overall Rating 4.8 out of 5 stars
Read All 61 Reviews

Review & Install Video

Well, here it is, our new project car, and as you can see I use the term new very loosely, you Fox body folks have been asking for it, so we’re going to give you a build unlike anything we’ve ever done before, we’re going to do a complete restoration on our 93 GT convertible, and you guys are going to be with us every step of the way. So what are our plans? Well, to say this thing is a little rough, would be the understatement of the century, we need to tackle just about everything there is on this car, I’m talking bodywork, paint, interior, headlights, and what’s left of our top just to name a few. Obviously we’re fans of just about every Mustang under the sun however there are a few that really get us going. One of these is the 93 Mustang Cobra, this was one of the first cars offered by Ford’s SVT division, and really set the tone as far as factory performance tuning is concerned however there was one problem, it was never offered in a convertible so we’re going to actually have a little fun with this build and make something we wish Ford had offered from the factory, we’re going to make our very own Mustang 93 Cobra convertible, which should really turn our tired old Fox into one bad little street machine. Before we get into the fun stuff, we need to take care of some much needed maintenance here on our 93, mainly the worn out and the 100000 plus drive train and body. So that’s the goal with this first step, we’re going to get our GT running like new again, and get the car ready for paint, because…yeah, we got a lot of work to do, so let’s get to it. Alright, 100000 miles of burnouts and hard launces has not been nice to our factory clutch, because it’s absolutely shot, so this is one of those areas where we’re not only going to freshen up, but we’re also going to upgrade, now our upgrade comes in the form of this Exedy Mach 350 stage 1 clutch, and the SR Performance clutch adjuster kit. This kit will replace our old, worn out, gummed up factory cable with this brand new adjustable cable as well as strengthen the weak plastic factory clutch quadrant with this brand new Billet piece. Basically we’re strengthening our overall shifting experience. Besides our beat clutch, our 302 motor is running extremely rough, we’re misfiring all over the place, and the power just isn’t there like it should be, so we’re going to give our motor a serious tuneup. Ryan and I are in the process of installing these iridium plugs as well as a new set of wires as well, on top of that we’re also doing a brand new distributor cap and rotor, and finally a brand new serpentine belt. All these parts should really get our 5.0 firing on all 8 cylinders again. As a little pointer for you whenever you’re doing a tuneup, we recommend using a little anti-seize on all your threads, just because you don’t want a stuck spark plug in your block. In addition, go ahead and throw a little dielectric grease on all your contacts, it’ll just help keep any excess moisture out. Unfortunately our slipping clutch and misfires are only part of the problem, when we were on the way back to the shop we noticed are car was running a little hot so we decided to overhaul our entire cooling system just to be safe. We’re ditching our factory radiator and mechanical fan in favor of this aluminum performance unit from Mishimoto, along with one of their electrical fans. This electrical fan will not only keep things cool, but by ditching that mechanical fan, we’re also going to free up some drag on our accessory belt, which in turn should free up some extra horsepower. To wrap up our entire cooling package we’re going with a brand new thermostat from Mishimoto, along with a new set of hoses from Ford Racing. Of course we have some performance stuff lined up after we get the car back from paint, but in the meantime we have to address this Frankenstein intake we found on the car, we’re going to replace it with this brand new SR Performance cold air intake which, besides giving us a nice little bump in power and sound, will more importantly get rid of this eyesore underneath the hood. Before we get out of the hood completely, we wanted to further reduce the parasitic drag on our accessory belt, so we decided to install this SR Performance smog pump delete kit. Could we run a smaller belt and eliminate the pump completely? Probably, but we wanted to do it right the first time, and clean up the engine bay in the process. Now that we’ve taken care of some necessary maintenance, let’s get to the next big part of the first stage of our resto. The only thing worse than the actual running condition of our GT is the physical condition, I’m not going to lie, this thing is pretty rough in just about every way, but that’s about to change, we’re going to send our GT off for some serious bodywork that includes a brand new paint job, but first, we need to take care of some problem areas. Some of these problem areas include a brand new set of smoked, one piece headlights, a new fender and a rear deck lid panel just to name a few but that’s not all that exciting, this is what’s going to turn our dream build into a reality, we’re going to outfit our 93 GT with a complete Cobra style body kit, along with this Cobra style wing, which when we’re done with our build, should turn our stock 93 vert, into one of the baddest, and possible one of the only, Foxbody convertible Cobras around. Well, that wraps up the first stage of the restoration here on our 93 GT, we took care of some much needed maintenance and got the car ready for the body shop, when we get the car back from paint, we’re really going to start having some fun with the interior and exterior styling, and of course give the car some much needed performance to back up that Cobra appearance, but in the meantime, I’m on my way to paint.

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9 Questions / 8 Answers

Ask a Question

How difficult? Exactly how difficult are these spark plugs to install? I've never changed mine or have even looked at them. Will I be able to do it without any issues? Thank in advance.


  • They are not hard to install as long as you have the right tools. Some of the things you will need are compressed air or a vacuum to clean around the plugs, a long extension for your ratchet, a spark plug socket with a rubber grommet inside for easy plug removal and a torque wrench for setting your new plugs to the proper tightness. You might have to remove the air intake tube to reach the 2 plugs near the firewall on the passenger side but its not hard at all. Also change your plugs when the engine is cool, not after it has just ran.


    Good Answer (11) (0)

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Heat Range? It says the heat range is much colder/hotter is that over stock plugs? I'm looking for slightly cooler plugs to help with slight engine ping.


  • check out this chart. There seems to be no industry standard, only what is set by each manufacturer. 5 from NGK seems to be on the higher side of the scale though


    Good Answer (3) (0)

Answer This Question I need this answered (0) (0)

Stock Wires Will these work with stock conductor wires?


  • yes you can. You'll see better gains by matching them with better wires though.


    Good Answer (1) (0)

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Customer Reviews (61) Write a Review

Overall Rating 4.8

out of 5 stars

  • 5/5

    Installation Time: Afternoon

    February 04, 2016


    I installed these with MSD spark plug wires and a MSD coil pack, and the car runs smoother than I ever thought possible! No, it doesn't make your car super fast, but it definitely makes it more enjoyable to drive. Thanks American Muscle!


    Year: 2002 Model: V6 Driving Style: Daily Driver 'Stangs I have owned: 1 Leawood, KS

    Helpful (1) (0)

  • 5/5

    Installation Time: Afternoon

    May 16, 2015

    Good Spark, car starts and idles perfect overtime.

    I was noticing that my Mustang was taking longer to start especially on cold mornings so I bought these plugs after reading that they can help and sure enough she starts up right away overtime now. They also helped with how the car idles and throttle response I think is improved too. Just make sure that you torque each one to the specifications because I've heard too many stories of these 4.6 Liters blowing the plugs out.


    Year: 2004 Model: GT Driving Style: Street / Strip 'Stangs I have owned: 1 Hooper, UT

    Helpful (1) (0)

  • 5/5

    Installation Time: Less than 1 Hour

    November 16, 2012

    great product

    My engine was running a little rough so i installed these spark plugs and they definitely helped smooth it out a little. helped with throttle response as well. the old ones were shot though so it makes sense these helped so much.


    Year: 1996 Model: Cobra PA

    Helpful (1) (0)

  • 5/5

    Installation Time: Less than 1 Hour

    January 20, 2012

    Silky Smooth

    They really smoothed out the rpm band. A bit expensive but I'd say they're worth it. They even came pre-gapped.


    Year: 2001 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 1 chicago, IL

    Helpful (1) (0)

  • 5/5

    Installation Time: Less than 1 Hour

    September 09, 2011

    a nice upgrade

    Together w/ screamin' demons coil packs and ford racing 9mm high performance spiral wires, my stangs fuel mileage seems to have improved. Didnt really feel a power difference and a week later my alternator went out -_- But after putting in a new one the voltage is steady where as it was jumpy before and the car idles GREAT.


    Year: 1996 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 3 Kissimmee, FL

    Helpful (1) (0)

  • 5/5

    Installation Time: Less than 1 Hour

    August 31, 2011

    High quality, perfect.

    These plugs are very high quality. Replaced my ford motorcraft plugs and felt/noticed a small difference. Runs smooth, idles great, accelerates better w/o hesitation. No change in gas milage however. They are made in Japan and make the motorcraft plugs look cheap.


    Year: 1997 Model: GT Driving Style: Street / Strip 'Stangs I have owned: 1 Denver

    Helpful (2) (0)

  • 5/5

    May 21, 2011

    ngk spark plugs

    i love these spark plugs. my engine was bogging and kinda hesitant but now runs like a champ haven't lost a race yet with theses new spark plugs. best investment you can buy. only problem was the fourth plug but just had to take a cover off. they come pregaped so no having to fool around with gaping plugs


    Year: 1997 Model: GT Driving Style: Street / Strip

    Helpful (1) (0)

  • 5/5

    February 17, 2011

    spark plugs

    These plugs are great. Better start ups, lower idle and lower rpm's in every gear which leads to a little better mpg. Would tell anybody to buy.


    Driving Style: Daily Driver

    Helpful (1) (0)

  • 5/5

    May 25, 2010

    spark plugs

    these spark plugs are good for stock or modified mustangs they just wake the muscle up from sleeping so much better than regular plugs a must just for some low end maintanence


    Helpful (20) (2)

  • 5/5

    February 04, 2011

    Best Plugs!

    My '01 Cobra had been having hesitation problems for a few months. Basically, it would seem to stutter at around 1900 rpm's. No one was able to figure out my problem and I was told that I would need a valve job. I replaced my plugs with the NGK Iridiums, and along with an oil change and a cleaned MAF and throttle body, the hesitation went away!!! I also noticed an increase in overall average MPG's. I highly recommend these plugs for any mustang!

    Fernando Pena

    Year: 1991 Model: Cobra Driving Style: Daily Driver

    Helpful (21) (3)

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