WIN $5,000 For Your Mustang! Enter Now
Talk to a Mustang Expert
1-888-332-7930
Mon-Thu 8:30a-11p, Fri-Sun 8:30a-9p

Free Shipping - Get it by Dec. 24th available on most items - Details

NGK V-Power Spark Plugs - Heat Range 6 (03-04 Cobra; 07-14 GT500)

Market Price $29.98 You Save 17% ($4.99)

$24.99

FREE Shipping
  • Item 525094
  • MPN# TR6

Out of Stock Notify Me Choose options to add to cart

Features, Videos & Details

  • Perfect for Stock Boost
  • V-Groove Technology
  • Improves Fuel Economy and Lower Emissions
  • Heat Range: 6
  • NGK Part# TR6; NGK Stock# 4177
  • 14mm Thread Pattern
  • Spark Plug Reach 0.690"
  • Fits 2003-2004 SVT Cobra and 2007-2014 Shelby GT500
  • Sold as a Set of 8

Review & Installation Video

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 performance V-Power plugs from NGK will improve fuel efficiency and lower your emissions.

Superior Design. NGK V-Power Performance Spark Plugs feature a copper core for its superior conductivity and a durable nickel alloy tip to assure a strong spark to keep your stang running at it's peak efficiency. The V-Power plug features a unique V-Groove that allows the spark to happen at the edge of the center electrode, so that the heat is not absorbed by the electrode itself, resulting in a complete efficient burn.

Application. This set of eight (8) NGK V-Power Performance Spark Plugs are specifically designed as a direct fit replacement for the 2003-2004 SVT Cobra and the 2007-2014 Shelby GT500 Mustangs.

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

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

Most Helpful Reviews

5/5
Hot Plugs

My 2013 GT500 Shelby Cobra had the original equipment spark plugs with 11,400 miles. I noticed the inside of the exhaust tips were too black, sign of running rich-too much fuel. So I opted for a set of ...

Read More
Helpful (1)

5/5
Ngk is above the rest.

I bought these plugs plugs for my tork tech powered gt. Gapping them were easy and we put them after we took off all the intake, rails, etc.

Helpful (1)

Overall Rating 4.9 out of 5 stars
Read All 15 Reviews

Customer Photos

You Might Also Like

2 Questions / 2 Answers

Ask a Question

What is the gap for these plugs? I checked several of them and they are at about .34 from NGK.

05GTHI

  • The NGK V-Power Spark Plugs, with the manufacturers part number TR6, stock number 4177 comes pre-gapped to .039"/1.0mm. You will still want to set gap on these prior to installation for your specific application.

    AMJEFF

    Good Answer (0) (0)

Question Resolved

Will these plugs work for a 2004 Mach 1 on 100 shot of nitrous? Are they cold enough, my car just has the basic CAI and exhaust. I want a good nitrous plug.

vityok

  • The NGK V-Power Spark Plugs - Heat Range 6 (03-04 Cobra; 07-14 GT500) are really designed to be just an upgraded factory replacement plug. I would not recommend these plugs for a nitrous setup. I would recommend a lower heat range spark plug.

    SalC7

    Good Answer (0) (0)

Question Resolved

More Products You Might Like

Customer Reviews (15) Write a Review

Overall Rating 4.9

out of 5 stars

Installation Time:Less than 1 Hour

  • Performance Gain 4.5 4.5
  • Fit 5 5



  • 5/5

    July 12, 2016

    Hot Plugs

    My 2013 GT500 Shelby Cobra had the original equipment spark plugs with 11,400 miles. I noticed the inside of the exhaust tips were too black, sign of running rich-too much fuel. So I opted for a set of NGK V-Power Plugs from American Muscle. I also installed a KandN Cold Air Intake and a JLT Oil Can on the passenger side to catch any oil before it slips into the supercharger. My GT500 runs way smoother and has better throttle response.

    Moe

    Year: 2013 Submodel: GT500

    Helpful (1) (0)

  • 5/5

    Installation Time: Less than 1 Hour

    August 19, 2014

    Ngk is above the rest.

    I bought these plugs plugs for my tork tech powered gt. Gapping them were easy and we put them after we took off all the intake, rails, etc.

    FastEddie03GT

    Year: 2003 Submodel: GT Kentucky

    Helpful (1) (0)

  • 5/5

    Installation Time: Less than 1 Hour

    September 18, 2015

    03 cobra back to life

    I bought these plugs for my terminator cobra because mine felt like they were going out, and they were bad, I changed them out in less than an hour and when i turned on the car and went around in it, I felt a huge power difference and it's crazy how much some plugs can do for your car. But these if you need new plugs they are great!

    Kris

    Year: 2003 Submodel: Cobra San Mateo California

    Helpful (1) (0)

  • 5/5

    Installation Time: Less than 1 Hour

    September 18, 2015

    Good plugs for my stock 03 cobra

    I used the plugs as a tune up on my 03 cobra. install was easy and smoothed out the the idle a bit.

    Max

    Year: 2003 Submodel: Cobra Waynesboro PA.

    Helpful (1) (0)

  • 4/5

    Installation Time: Less than 1 Hour

    November 23, 2014

    Adding boost get these

    I added a 10% pulley and a 2.6 pulley on my 08 gt500 (building over 15 psi of boost) and didn't change plugs. The car would lose power, misfire, and detention was taking place at WOT. Ordered these plugs, they showed up the next day. Install was easy just be sure the gap there correctly and add some anti-seize for good measure. The plug change fixed all the problems stated above. Great product and great delivery time

    JacobLane132

    Year: 2008 Submodel: GT500 Langley, Va

    Helpful (1) (0)

  • 5/5

    Installation Time: Less than 1 Hour

    May 22, 2015

    Great Plugs!

    Great plug to upgrade to when you are doing a tune up!

    AMCoalK

    Year: 2004 Submodel: Cobra

    Helpful (0) (1)

  • 5/5

    Installation Time: Less than 1 Hour

    February 13, 2015

    New Plugs

    I replaced the stock 2007 plugs with the NGKs. The install was easy, after removing the CAI. Haven't had a chance to drive the car much, but I'm looking forward to hitting the streets when the temps go up.

    CBRA6

    Year: 2007 Submodel: GT500 Chester, VA

    Helpful (0) (1)

  • 5/5

    Installation Time: Afternoon

    January 16, 2015

    Great product

    Works great, car runs a lot smoother. You can definitely tell a difference in the throttle response. Definitely regain a few horsepower.

    Sid03steeda

    Year: 2003 Submodel: GT Charlotte, NC, USA

    Helpful (0) (1)

  • 5/5

    Installation Time: Less than 1 Hour

    November 04, 2014

    Great plugs

    I had stock plugs gad 500 on them when I changed to new plugs nice and smooth lots of power great for the price will get them again

    speedi

    Year: 2008 Submodel: GT500 California

    Helpful (0) (1)

  • 5/5

    Installation Time: Less than 1 Hour

    August 24, 2014

    NGK spark

    Nice upgrade, You can really feel a difference. Very happy with my purchase

    MadMak

    Year: 2003 Submodel: Cobra El Paso, TX, USA

    Helpful (0) (1)

  • 5/5

    Installation Time: Less than 1 Hour

    June 12, 2014

    Cool Gains

    Definitely don't worry about detonation with this plug. Cudos to AM for great tech advice and prompt delivery. The Road is Long, Drive Safely :)

    Sin4ACezn

    Year: 2007 Submodel: GT500 Fresno, CA, USA

    Helpful (0) (1)

  • 5/5

    Installation Time: Less than 1 Hour

    April 16, 2014

    09 GT500 NGK V-Power Plugs

    Installed these new plugs when I added at 2.60 pulley, open air cleaner and Bama tuner. Easy to install.

    steffens10

    Year: 2009 Submodel: GT500 MN

    Helpful (0) (1)

  • 5/5

    Installation Time: Less than 1 Hour

    June 14, 2016

    Ngk heat range 6 v power spark plugs

    It took about a hour to install these and they perform excellent on my 2011 GT500 very happy with the results :)

    Shelby11

    Year: 2011 Submodel: GT500

    Helpful (0) (0)

  • 5/5

    Installation Time: Afternoon

    June 09, 2016

    Great Plugs for Procharged Mustangs

    I had autolites 3923 in my 1994 procharged 331 stroker Cobra. After purchasing MSD 6AL, Demon Screaming Coil, and Ford racing 9mm wires, I finally installed these plugs and I have smile on my face every time I take my Cobra out. Car idles much better, throttle response is awesome and most importantly during boost and over 4K RPM, my Cobra runs like BAT OUT OF HE11! My plugs are gapped at .030. Previously before getting MSD box and coil and wires, I was gapped at .025. If you have aluminum heads, don't forget the anti-seize. I completely forgot and pulled all the plugs out after installing them just to re-do. Do not neglect ignition parts if you are boosted. They do make a big difference in boosted cars.

    Ryan

    Year: 1994 Submodel: Cobra

    Helpful (0) (0)

  • 5/5

    Installation Time: Afternoon

    May 27, 2014

    Sweet sparks

    Excellent replacement! I can feel it! Did a whole tune up and these sparks were the perfect product for my Terminator! Definitely recommend them!

    RedfireTermi

    Year: 2003 Submodel: Cobra Kailua, HI, USA

    Helpful (0) (0)

Related Mustang Categories