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Granatelli Motor Sports 3V Pro-Series Coil Packs (05-10 GT)

Item 65009
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      Product Information

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


      • 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.

      Fitment: 2005 2006 2007 2008 2009 2010 Details

      MPN# 28-1812CP

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (12)

      Write a Review

      Ratings Summary

      3.8 out of 5 overall rating from 12 customers

      Installation Time: Afternoon

      Installation Cost: $250-$500

      • August 22, 2018

        2 2007 GT - Ron

        Pro performance coils

        The spark plug connector on 4 of the coils were poorly crimped to the heavy gauge wire. When pushing the coil onto the plug it would push the connector further on the wire until the wire would hit the top of the plug. I had to reposition the connector and crimp them properly. Poor assembly for very expensive coils.

        Helpful (3)
      • July 21, 2018

        3 2008 GT - Johnb Installation Time: Less than 1 Hour

        No noticeable difference

        Installed these in less than an hour. The boot is the same size as stock but the wire is a bit shorter than stock. About 200 miles on them now with no issues . No noticeable gas mileage increase or performance gains .

        Helpful (3)
      • May 23, 2017

        5 2010 GT - JulioV Installation Time: Less than 1 Hour

        GMS 3V pro series coil pack

        My car starts up quicker and idles way smooth, and I don't have to wait too long for its normal idle when I turn it on

        Helpful (7)
      • September 21, 2013

        5 2005 Other - RoushRules Installation Time: Less than 1 Hour

        GMS Coil Pack

        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.

        Helpful (7)
      • October 08, 2012

        5 2006 GT - ralphe Installation Time: Shop Install Installation Cost: $250-$500

        Light My Fire

        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's not always about the numbers.

        Helpful (7)
      • October 22, 2011

        1 2008 GT - DavefromNJ Installation Time: Less than 1 Hour

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

        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.

        Helpful (13)
      • November 15, 2010

        1 - Peter

        over priced and over rated

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

        Helpful (11)
      • September 24, 2010

        5 - Nick

        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 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.

        Helpful (17)
      • August 21, 2009

        4 - Bill

        GMS Coils

        Great coils a little pricey but worth it.

        Helpful (9)
      • July 30, 2009

        5 - Mike

        Great product

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

        Helpful (9)

      Questions & Answers (4 answers)

      4 Top Rated Questions

      hey everyone now since these coils have a very high voltage output would you say that the spark plugs would have to have a larger gap than normal? or not ?what would you recommend to do

      • You would not need to increase the gap of your spark plugs when running these upgraded coils.

      Helpful (0)

      Are there any special spark plugs required for these coils with a procharger P1 HO set up? If so which ones? I have 437hp to the ground with a automatic transmission. I have stock coils on it now. I was thinking about the Brisk 3VR14S. Would this be a good combination? And what is the warranty on these coil pacs? Thanks Skippy

      • The GMS 3V Pro-Series Coil Pack themselves do not have any special requirements for spark plugs, however running a supercharged engine typically requires spark plugs of a colder heat range. The Brisk 3VR14S should be of an appropriate heat range for your power level.

      Helpful (0)

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

      • The GMS 3V Pro-Series Coil Pack does not require a tune, however, if your current ignition system is unable to provide the voltage required to burn all of the fuel, I would highly recommend a tune to take advantage of the increase in voltage.

      Helpful (0)

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

      • Stronger the spark the better it burns the fuel.

      Helpful (0)
      Post Your Question

      Installation & What's in the Box

      Installation Info

      What's in the Box

      Hardware included:
      • (8) Eight Coil Packs

      Tech Specs


      • Application: 2005-2010 GT & Bullitt Mustangs
      • Contains: 8 Coil Packs (Coil, Connector, and Boot)

      Will It Fit My Mustang

      • Bullitt - 08, 09
      • GT - 05, 06, 07, 08, 09, 10

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