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GMS 3V Pro-Series Coil Pack (05-10 GT)

9 Reviews
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  • Item #65009
  • MPN #28-1812CP
  • Market Price $604.99
  • You Save 9% ($55.00)
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  • Gain up to 35HP.
  • Direct replacement.
  • Up to 400% more voltage.
  • Simple 1 hour install.
  • Perfect for forced induction applications.
  • Fits 05-10 Mustang GT & Bullitt.

Gain Up to 35HP. The Granatelli Coil-on-Plug upgrade kit is the perfect addition to your modified S197 'Stang, especially if you have a forced induction setup. Your weak OEM coils don't deliver a strong enough spark to your plugs to ensure you're getting the most power possible from your engine, especially once you've added high performance parts. Delivering a strong spark is key to getting the most from your mods. This kit adds up to 15HP on naturally aspirated Mustangs and an impressive 35HP on turbo or supercharger setups.

Up to 400% More Voltage. Your stock coils deliver 20,000 volts, versus the GMS coils which are rated at 60,000 volts.

Complete Kit. This complete kit includes all hardware necessary for installation including the 8 coil packs and stainless snap lock plug connectors.

Easy Installation. Upgrading your coils is easy with this kit, which is OBD-II safe and a direct replacement for your OEM setup. You'll enjoy more power, improved throttle response, and even better fuel economy with an hour or less install time using basic hand tools from this GMS Coil Plug Kit.

Application. The Granatelli Coil-on-plug upgrade kit is designed for 2005-2010 three valve 4.6L Mustangs, including the 2005-2010 Mustang GT and the 2008-2009 Bullitt.

Mustang Fitment: 2005 2006 2007 2008 2009 2010 Details

What's in the Box
Hardware included:
  • (8) Eight Coil Packs
Installation Info
Tech Specs


  • Application: 2005-2010 GT & Bullitt Mustangs
  • Contains: 8 Coil Packs (Coil, Connector, and Boot)
  • Bullitt - 08, 09
  • GT - 05, 06, 07, 08, 09, 10

Most Helpful Reviews View All

Overall Rating 4/5 Write a Review
GMS Coils

If you are looking for a good power adder better gas mileage combined these coil are the way to go. They made a great addition to my JLT CAI, JBA longtubes, throttle body and pulleys. I can definitely

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Helpful (8) (0)

Great product

Installed in less than 30 minutes, great power increase, and getting better gas mileage

Helpful (2) (0)

Customer Photos (1) View All

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

2008 Mustang GT/CS I have a completely stock Stang. Still safe to install considering the 40,000 voltage increase?

JAYGEE Year: 2008 Model: GT

Good Question (0) (0)
  • Stronger the spark the better it burns the fuel.

    Helpful (0) (1)

    leroy780 Year: 2013 Model: GT

    Top 250 Contributor

Answer This Question

Tune? Is a tune in any way required or suggested with this mod?

MustangChuck Year: 2008 Model: GT

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Good Question (0) (0)

Reviews (9) Write a Review

  • 5 Stars .67 67%
  • 4 Stars .11 11%
  • 3 Stars 0 0%
  • 2 Stars 0 0%
  • 1 Stars .22 22%

out of 5 stars

7 Customers Recommend this Product

Installation Time:Afternoon

Installation Cost:$250-$500

  • Performance Gain: 3.666667 3.7/5
  • Fit: 3 3/5
  • Bang For Your Buck: 3.333333 3.3/5
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  • 5/5

    GMS Coils

    September 24, 2010

    If you are looking for a good power adder better gas mileage combined these coil are the way to go. They made a great addition to my JLT CAI, JBA longtubes, throttle body and pulleys. I can definitely notice an increase in power and my mileage went from 22 to roughly about 27 MPG on the highway. These coils are pricey but well worth the money. The only noticeable feature I didn't like about these coils is the placement of the stickers on the coil body. You can see the stickers on one side of the motor and the others are turned around and all you see is black. Installation was very easy and quick. Installs in about 25 minutes if just changing coils with proper tools.


    Driving Style: Daily Driver

    Helpful (8) (0)

  • 5/5

    Great product

    July 30, 2009

    Installed in less than 30 minutes, great power increase, and getting better gas mileage


    Helpful (2) (0)

  • 1/5

    Not so great.... Buy something that gives you HP

    October 22, 2011

    I agree with Peter. I put these on in anticipation of installation of a Comp Cams Camshaft. The car seemed OK but the idle was a bit rough. After the Cams were installed the car idled very rough and had a bad drone and annoying exhaust. The care would throw a check engine code about every four to five days... indicating a random misfire. The tachometer would oscillate very badly at idle and the car jerked and bucked. I attributed a lot of the problems to the very radical cams. I then remembered what Peter said and put the stock coils back in. The engine idle smoothed out after a few miles and the tachometer was very steady. The annoying exhaust sound disappeared and now sounds great. In looking at the coils, my car is a 2008 with the 2007 plug in it. The wire inside the coils boot looks to be too short and might not reach the plug. It looked like there was arcing in the boot and that was probably why the idle was so rough as it was not snapped onto the plug being about a quarter of an inch too short. The stock coils has a spring inside that reaches the end of the boot so you get a good connection at the top of the plug. Possibly the coils are made for the 2008 and newer cars that have the different plug. Maybe the new plug is not as deep inside the heads and so you get the plug end of the coil to actually snap onto the plug like the old spark plug wires did. The wire that connects to the coils does not snap on and lock like on the stock coils and is in a different position putting stress ont he wire and connector. All and all I am not happy with this part. I have to admit that American Muscle did not recommend this part for my car, but I went ahead and purchased it anyway. Sometimes you should listen to the experts. This coil may be good for some applications but in my case it was not a good fit and was costing me HP and Mileage. If you hae a 2005 to mid year 2008 I would caution you to think very carefully before purchasing this item. I had these too long to be able to send them back... so too late too smart. I hope I can save someone else from having the headache and check engine light troubles I had with them. The car has no problems now with the Cams and feels like it picked up a lot of HP with the stock coils.


    Year: 2008 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 2 Toms River, NJ

    Helpful (4) (2)

  • 5/5

    oh my god

    April 29, 2009

    i\'m new to this muscle car thing but love it I have a 06 mustang gt was for gas saveings and power a +++ well did I get it hell yea and them some love could not imagine my car with out it


    Year: 2006 Model: GT

    Helpful (2) (1)

  • 4/5

    GMS Coils

    August 21, 2009

    Great coils a little pricey but worth it.


    Helpful (1) (1)

  • 1/5

    over priced and over rated

    November 15, 2010

    I purchased these about 3wks ago,car worked ok but started missing,so put old back in and car is working better then ever.


    Driving Style: Street / Strip

    Helpful (3) (4)

  • 5/5

    07 3v coils

    August 08, 2008

    A must have product for 3 valves because plug gap cannot be closed. So you must throw more spark energy at the plugs to keep from misfiring. When you misfire, O2 sensor will read rich. Car computer will command too lean out A/F ratio. Not good thing when your running boost.

    Lynn K&G Speed

    Year: 2007

    Helpful (1) (3)

  • 5/5

    GMS Coil Pack

    September 21, 2013

    These were easy to install, put new HTO plugs in at the same time. Immediate difference in sound and performance. Also took care of misfire problem that I was having.


    Year: 2005 Model: Other Driving Style: Street / Strip 'Stangs I have owned: 2 Meridian, ID, USA

    Helpful (0) (0)

  • 5/5

    Light My Fire

    October 08, 2012

    On my '06 GT SCd 4.6 with 62mm TB, BBK shortys. 3.73, Hurst short throw and FRPP mufflers no question on the power gain. Granted not dynoed after install(before 430 rwhp) but a driver knows...it's not always about the numbers.


    Year: 2006 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 4 Northern Virginia

    Helpful (0) (0)

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