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NGK Laser Iridium Performance Spark Plugs (03-04 Cobra; 07-14 GT500)

6 Reviews
Our Price

$109.99

  • Item #64019
  • MPN #4477
  • Market Price $129.99
  • You Save 15% ($20.00)
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Features
  • High Performance replacement
  • Improves fuel economy and lower emissions
  • Heat Range: 6
  • NGK part# 4477
  • Fits 03-04 SVT Cobra and 07-14 Shelby GT500
  • Sold as a set of 8
Description
Regular Maintenance. Replacing your old weak spark plugs is paramount to keep your engine running smoothly and efficiently, so why replace them with the same old sub-par stock plugs when high performance plugs from NGK will improve fuel efficiency and lower your emissions.

Superior Construction. NGK Laser Iridium Performance Spark Plugs feature an iridium disk that is welded on the center electrode and a platinum disk that is welded on the ground electrode to reduce the wear rate of both surfaces ensuring greater durability and longer life. NGK uses pinpoint precision laser welds to reduce excess debris decreasing the required voltage to bridge the spark gap for a more efficient burn.

Application. This set of eight (8) NGK Laser Iridium Performance Spark Plugs are specifically designed as a direct fit replacement for the 2003 to 2004 SVT Cobra and the 2007 to 2014 Shelby GT500 Mustang equipped with the supercharged 5.4 liter V8.

Mustang Fitment: 2003 2004 2007 2008 2009 2010 2011 2012 2013 2014 Details

What's in the Box
  • (8) Spark Plugs
Installation Info
Fitment
  • Cobra - 03, 04
  • GT500 - 07, 08, 09, 10, 11, 12, 13, 14

Most Helpful Reviews View All

Overall Rating 4.5/5 Write a Review
5/5
Wake That Pony Up!!!!!

Wow! These spark plug's Kick some Serious Tail! Now you would think that spark plug wouldn't give you any Horse Power, But these plugs increase performance. And do alot more then what they say they can

Read More
Helpful (1) (0)

5/5
NGK Iridium Plugs

Great producer and great customer service. I definitely recommend this product.

Helpful (1) (0)

Customer Photos

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Q & A (1 Questions, 2 Answers) Ask a Question

what should these be gapped at on a minor modded 04 cobra. Mods are catback exhaust, CAI and 93 octane tune.

Soup Year: 2004 Model: Cobra

Question Resolved
Good Question (0) (0)
  • The factory gap is all you need to have on them. The only time you would ever need to adjust the gap would be with aftermarket cams or nitrous.

    Helpful (1) (1)

    Best Answer

    96MysticCobra Year: 1996 Model: Cobra

    Top 1000 Contributor

Show 1 more answer

Reviews (6) Write a Review

  • 5 Stars .50 50%
  • 4 Stars .50 50%
  • 3 Stars 0 0%
  • 2 Stars 0 0%
  • 1 Stars 0 0%
4.5

out of 5 stars

6 Customers Recommend this Product

Installation Time:Less than 1 Hour

  • Performance Gain: 4.166667 4.2/5
  • Fit: 4.833333 4.8/5
  • Bang For Your Buck: 4.833333 4.8/5
Filter By Sort By
  • 5/5

    NGK Iridium Plugs

    November 26, 2014

    Great producer and great customer service. I definitely recommend this product.

    BenWaller

    Year: 2010 Model: GT500 Driving Style: Street / Strip 'Stangs I have owned: 3 Germany

    Helpful (1) (0)

  • 4/5

    Easy install, great fit

    January 26, 2014

    My stock spark plugs have been in the car since 03, took less than an hour to install, no hassle at all no huge noticeable power gains...but im sure my engine and supercharger are very happy with my decision.

    Rydogg

    Year: 2003 Model: Cobra Driving Style: Show 'Stangs I have owned: 2 Massachusetts, USA

    Helpful (1) (0)

  • 4/5

    No noticable gain

    October 14, 2012

    Was great plug, look amazing, though had to adjust every plug's gap, which isn't hard. I have had the plugs for over a 2k miles, and haven't noticed any increase in mpg, quicker start ups or throttle response. But this plug was the best money for the mileage, which is 100k where the other plugs rating was 50k miles worth of use.

    King03Cobra

    Year: 2003 Model: Cobra Driving Style: Daily Driver 'Stangs I have owned: 2 Yelm, WA, USA

    Helpful (1) (0)

  • 5/5

    Wake That Pony Up!!!!!

    March 27, 2012

    Wow! These spark plug's Kick some Serious Tail! Now you would think that spark plug wouldn't give you any Horse Power, But these plugs increase performance. And do alot more then what they say they can do! My buddy has a 03 Mach 1 and he was looking for some Laser Iridium plug's, and told me that AM dosen't carry them for the 03 Mach 1. But that he went to his local O'Reilly's and got them for 12.00$ a plug. Just go to show you good things come to those who wait, And better things to those don't! I think you should go buy you some of these plug! So get off your a** and go buy some!

    AndresGarza

    Year: 2003 Model: Cobra Driving Style: Race 'Stangs I have owned: 2 Port isabel

    Helpful (1) (0)

  • 4/5

    Plug Upgrade

    February 18, 2013

    I changed from OEM plugs just before 50k miles. The old plugs did not look pretty. One wasn't even screwed in tight and there were obvious signs of blow-back. Yo can't go wrong upgrading your stock plugs to these iridium plugs. It was a little tricky getting the old plugs out, so take your time and do it right. I also painted the coil covers Ford blue while they were off. Couple hours worth of work that's totally worth it.

    Top 500 Contributor

    Skinny420

    Year: 2008 Model: GT500 Driving Style: Daily Driver 'Stangs I have owned: 2 Cibolo, Tx

    Helpful (1) (1)

  • 5/5

    Great Plugs!

    July 30, 2012

    Straight forward. If you are running higher boost (pulley, aftermarket s/c...) check the plug gap. It's a bit tricky, but gently tapping the grounding strap is the only way to do it.

    Cobrafiend

    Year: 2003 Model: Cobra Driving Style: Daily Driver 'Stangs I have owned: 3 Sumter, SC, USA

    Helpful (0) (2)

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