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Granatelli Motor Sports 4V Hot-Street Coil Packs (99-04 Cobra, Mach 1)

Item 65011
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Market Price $372.20 You Save 10% ($36.85)
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    Features & Details

    • Perfect for Mustangs with Minor Bolt-Ons.
    • More Horsepower and Torque.
    • Increased Fuel Economy.
    • Kit Includes (8) 40k Coil Packs.
    • Designed for 99-04 SVT Cobra & 03-04 MACH 1's.
    More Horsepower and Torque. The Hot Street Series 40,000 volt coils provide 20,000 more volts then stock OEM factory coils to help produce more power from your modern modular motor and are a perfect match for stock engines or mustangs with minor performance upgrades.

    Better Fuel Economy. A hotter spark burns fuel more completely releasing all it's energy translating into better fuel economy and power.

    Application. These Granatelli Motor Sports 4 valve Hot Street Coil Packs are designed for use with the 1999-2004 SVT Cobra and 2003-2004 MACH 1 Mustangs .

    Fitment: 1999 2001 2003 2004 Details

    MPN# 25-4001

    CA Residents: WARNING: Cancer and Reproductive Harm -

    What's in the Box
    • (8) Coil Packs
    Installation Info
    Tech Specs
    Will it fit my Mustang?

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          Customer Reviews (13) Write a Review

          Overall Rating 4.5

          out of 5 stars

          Installation Time:Afternoon

          Installation Cost:$100-$250

          • Performance Gain 4.333333 4.3
          • Fit 4.333333 4.3

          • 5/5

            February 18, 2018

            Easy and fast process.

            I have a 2003 10 year anniversary cobra fairly stock. Changed the o2 sensors so decided to replace coils and plugs. Easy process when doing both. Took a little over an hour and easy to do. Happy to say that you could feel the difference when finished.


            Year: 2003 Submodel: Cobra

            Helpful (4)

          • 5/5

            Installation Time: Less than 1 Hour

            December 04, 2017

            2003 mustang mach 1

            I really didn't realize how bad my mach was running until I installed these coils. Can't describe the feeling.Runs and idles like a sewing machine. Do yourself and your engine a favor and get these coils. Worth every penny.


            Year: 2003 Submodel: Mach 1

            Helpful (7)

          • 1/5

            Installation Time: Shop Install

            Installation Cost: 0-$100

            March 26, 2014

            Only 8 months old and two are bad already!

            I purchased this set exactly 8 months ago for my Mach 1 and two are bad already, leaving my Mach misfiring miserably. I noticed a decent response while they worked, but for the price I'm livid that they didn't last longer. Definitely wouldn't recommend this product- they're lousy! I usually don't doubt anything I buy from AM, but an 8 month life span for a $300 coil set is ridiculous.


            Year: 2003 Submodel: Mach 1 Philadelphia, PA, USA

            Helpful (8)

            • Response from AmericanMuscle

              We haven't heard of other customers having this issue in the past. My apologies two of the plugs you received no longer work as they should. We can definitely get a replacement set shipped out for you right away.

              Lisa, Customer Care

          • 4/5

            Installation Time: Shop Install

            Installation Cost: $100-$250

            January 22, 2014

            This product is alright

            Had problem fitting boots over plug ended up having to take them the the SpeedLab in Albuq.N.M. After becoming a few hundred bucks poorer,my 2001 Cobra was once again eat riceburners


            Year: 2001 Submodel: Cobra Albuquerque, NM, USA

            Helpful (7)

          • 5/5

            Installation Time: Less than 1 Hour

            March 26, 2013

            Hot street coils

            i just installed these on my car ,took about an hour working slowly. the first thing i noticed was that the car had better throttle response,then when i drove it it felt much peppier & nimble. i got i just to nail it from a stoplight with tracion control off and it rev'd so fast it smoked the tire for about a block long,these things work good im happy with them.As far as the stories of them failing time will tell but so far no complaints,nice bang for the buck! thanks AM.


            Year: 2004 Submodel: GT New York

            Helpful (8)

          • 5/5

            Installation Time: Less than 1 Hour

            February 20, 2013

            Noticeable acceleration increase

            Installed the coil packs along with the NGK Iridium IX Performance Spark Plugs. Smooth...


            Year: 2003 Submodel: Mach 1 Dothan, AL, USA

            Helpful (7)

          • 5/5

            Installation Time: Less than 1 Hour

            October 08, 2012

            Night and Day difference!

            Complete night and day difference between the GMS 4v Hot-Street Coil packs and OEM. I had a coil pack going bad but couldn't pin point which one, installed the GMS coil packs and WOW what a difference. Instant grin on my face(and I swear the Pony in my grille was smiling too) the first time my foot hit the floor. This product has a great fit, produces a great power gain and is well worth the money! I definitely recommend this product for everyone.


            Year: 2003 Submodel: Mach 1 Killeen, TX, USA

            Helpful (11)

          • 4/5

            Installation Time: Less than 1 Hour

            April 27, 2012

            Definetaly worth it!

            Noticed smooth acceleration right away. Fitments pretty good.


            Year: 2003 Submodel: Cobra Montreal

            Helpful (7)

          • 5/5

            Installation Time: Afternoon

            March 22, 2012

            Granatelli coils for Mach 1

            The coils worked great seems to be about a 10 hp improvement from stock. GreatB


            Year: 2004 Submodel: Mach 1 Albuquerque, N.M.

            Helpful (7)

          • 5/5

            August 09, 2011

            Wake Up!

            Great Coils, put these on my Mach 1 and wow, get you pony running, easy install, got a 4 Valve 2 Over Stang, get these coils and wake that Pony up!


            Year: 2004 Submodel: Mach 1

            Helpful (9)

          • 4/5

            June 29, 2011


            Its more powerful & it gives more spark so you can hear it


            Year: 2004 Submodel: Mach 1

            Helpful (7)

          • 5/5

            April 02, 2011

            gms ford 4v hot-street coil pack 99-04

            really liked them easy to install gave some more power read a article in a mag about them

            richard fite

            Year: 2003 Submodel: Mach 1

            Helpful (9)

          • 5/5

            March 11, 2009


            a little bit more than what i wanted to spend on wires, but totally worth it!!!


            Helpful (11)

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