Free Shipping On Orders Over $49. Details

Talk to a Mustang Enthusiast
M-F 8:30A-11P, Sat-Sun 8:30A-9P
Win $15,000!! Enter Now

Granatelli Motor Sports Pro Series Extreme Coil Packs (11-14 GT; 12-13 BOSS 302)

Item 391705
Call a Mustang Enthusiast at 1-877-887-1105
M-F 8:30A-11P, Sat-Sun 8:30A-9P
Market Price $819.99 You Save 16% ($131.24)
Our Price

$688.75 (set of 8)

FREE Shipping

Will this fit your Vehicle?

Select a different vehicle Help?
Update or Change Vehicle
In Stock

Ship to: Ashburn - 20149
Sorry, please enter a valid US or CA postal code
We're sorry, zip can't be updated at this time.
    Create a list
    Add to New List

    Saved - View your saved items

    We're sorry. We couldn't save this product at this time.

      Product Information

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


      • Perfect Upgrade for Forced Induction and Nitrous Applications
      • Increases of 12 HP NA and 25 HP SC
      • Improves Gas Mileage and Throttle Response
      • 0 ohm Technology
      • EMI and RFI Suppression
      • Coil Voltage: 65,000 Volts
      • Direct Bolt-on Replacement
      • Made in the USA
      • Fits 2011-2014 GT & Boss 302 Mustangs


      Increases Spark Energy for More Power. Are you running a supercharger, turbocharger or a nitrous setup on your Coyote powered GT Mustang? If so, then you should seriously consider upgrading to a set of Granatelli Motor Sports (GMS) Pro Series Extreme Coils. The stock OE coils are weak by comparison and are prone to spark blowout under forced induction. Where the GMS Extreme Coils produce an amazing 65,000 volts, that's 45,000 more volts than the factory coils, which results in more power, better throttle response and no chance of spark blowout. This GMS Coil Kit will add up to 12HP on naturally aspirated Mustangs and an impressive 25HP on turbo or supercharger setups.

      Better Fuel Economy. GMS Pro Series Extreme Coils not only improve the rear wheel power of your GT, but they also improve its fuel economy as well. After installation Coyote owners have reported up to a 10% increase in gas mileage. Because of the higher voltage of these Extreme Coils your spark plugs will produce a hotter spark. This hotter spark will burn the air/fuel mixture more completely releasing all of its potential energy which translates into better fuel economy and more power.

      0 ohm Technology. Granatelli Motor Sports proudly manufactures their Pro Series Extreme Coil Packs right here in the USA. Featuring patented “0” ohm technology GMS Coils use a silicone magnetic steel core that not only improves spark power, but has 0 ohms of resistance so all the spark energy of the coil transfers to the spark plug. This patented design also suppresses Radio Frequency Interference (RFI) and Electro Magnetic Interference (EMI) to effectively shield your Mustangs sensitive electronic components from interference.

      Application. This set of eight Granatelli Motor Sports 4-Valve Pro Series Extreme Coil Packs are designed as a direct fit performance upgrade for the 2011 to 2014 GT and Boss 302 Mustangs equipped with the Coyote 5.0L 4 valve V8 engine.

      Fitment: 2011 2012 2013 2014 Details

      MPN# 28-1815SC

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (2)

      Write a Review

      Ratings Summary

      5 out of 5 overall rating from 2 customers

      Installation Time: Less than 1 Hour

      • September 07, 2017

        5 2012 Boss - JohnK Installation Time: Less than 1 Hour

        Expensive but worth it to me.

        Install took about an hour, but took my time and cleaned the coil pack covers in the process. Started up and noticed a mis-fire on passenger side bank after fast idle. At this point it tripped the code. Waited for it to cool down and swapped first two and last two cylinders. Started up and there was no mis-fire, took it for a test drive and seemed good. Went to take it into the dealer next morning to have code reset. Low and behold the mis-fire was back. Dealer checked and found all cylinders were randomly misfiring. Called GMS and they said bad sets do happen and go through AM for return/new set. Called AM and received prompt service and new set. Let dealer install new set as I didn't feel like having the problem again (just encase). As for gas mileage, don't know yet. As for performance, can't tell if idles smoother due to track key, I can feel a difference 3K and above, revs smoother and easier.

        Helpful (11)
      • July 14, 2016

        5 2016 GT - zezo

        Extreme coil pack

        It's really good product and recommended for everyone has mustang , you will feel the different aloot it gives more HP and the most important thing it saves gas and u will notice the different

        Helpful (15)

      Questions & Answers (6 answers)

      5 Top Rated Questions

      I have a 13 Mustang GT and I'm running the Bama 93 octane Race tune. Is there any chance that these high voltage coils could burn a piston when using the Bama 93 octane race tune? When I go to "Car Gatherings" I put the Bama Ghost tune in (which is my 93 octane race tune with a Ghost tune overlay). I heard Ghost tunes make that awesome sound by "washing" the cylinders with more fuel than it can burn. I would "assume" then that it would NOT be a good idea to run these high voltage coil packs with a Ghost tune. Can you confirm this? Lastly, since I mentioned the Ghost tune, I haven't pulled the plugs yet to look at them but do Ghost tunes eventually foul out the plugs?

      • Hi,This GMS Pro Series Extreme Coil Pack will not interfere with your Ghost Cam tune, because the ghost cam happens during idle and not while driving, and the ghost cam is made using variable valve timing to make the lob sound no extra fuel is added to the cylinder.

      Helpful (2)

      Would this not be recommended on Stock Applications,or would it help with MPG,etc even while stock? All I have is a CAI and a 93 Octane Race/Performance Tune installed. Other than that it's stock.

      • The GMS Pro Series Extreme Coil Pack will work with your application. You will see a mpg gain, however this will be a small gain, typically less than 1 mpg.

      Helpful (1)

      Will these fit the 2017 Mustang GT?

      • No, this GMS Pro Series Extreme Coil Pack is specifically designed for the '11-'14 GT and Boss models with the V8 and intended for 5.0L engines built before 2/23/16.

      Helpful (1)

      Do I need to change the stock wire which is connected to the stock coil when I going to change to Pro series Extreme coil?

      • The Pro Series Extreme Coil Packs will not require you to change your existing coil wires for installation.

      Helpful (0)

      Hello, quick question. Would these coils work with my GT500? If so, how beneficial would it be. Thanks

      • Hello! The GMS Pro Series Extreme Coil Pack will not fit a GT500.

      Helpful (0)
      Post Your Question

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (8) Coil Packs

      Tech Specs

      Will It Fit My Mustang

      • Boss 302 - 12, 13
      • GT - 11, 12, 13, 14

      Intended for 5.0L Motors Built Before 2/23/16.

          Related Mustang Categories