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Accel Super Coil Packs; Yellow (99-04 Cobra, Mach 1)

Item 37223
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      Product Information

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


      • 10-15% More Energy Than OEM Coils
      • More Horsepower
      • Direct Bolt-On
      • Kit Includes (8) Coil Packs
      • Designed for 99-04 DOHC Four Valve Mustangs


      More Horsepower. The Accel Super Coil On Plug Kit makes more power then the wimpy stock oem factory coils to help produce more horsepower from your modern DOHC modular motor and are a perfect match for stock engines and engines with minor performance upgrades.

      Superior Design. Accel coils feature an advanced bobbin technology, highly specialized silicone magnetic steel cores, along with optimized winding, resistance and turns ratios to delivery 10-15% more energy than the stock OEM coils. More energy equals a hotter spark that burns fuel more completely releasing all it's potential energy translating into better fuel economy and more power that you can feel.

      Application. These Accel four valve Super Coil On Plugs are designed as a direct performance replacement for the 1999 to 2004 DOHC Cobra and Mach 1 Mustangs.

      Fitment: 1999 2001 2003 2004 Details

      Accel 140034-8

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (31)

      Write a Review

      Ratings Summary

      4.7 out of 5 overall rating from 31 customers

      Installation Time: Less than 1 Hour

      • March 12, 2020

        1 2003 Cobra - Nastynate2424 Installation Time: Less than 1 Hour

        Accel coil pack

        I experienced sputtering and break up under wide open throttle conditions w these coil packs. This did not happen Immediately and these conditions developed after 6 months of use. I thought I had some other issues going on w my cobra so it took a long time to diagnose. I could not figure out why my cobra was running so terribly so after many trial and errors w new plugs, new connectors, fuel pressure testing, multiple scanners, I decided to go back to the motorcraft coil packs. After starting up and letting car warm up, I gave it wide open throttle and my car is back to running like a champ. I don’t know which coil pack went bad or if multiple coil packs were bad but no more problems. I only post this bc I don’t want someone else to go through this headache.

        Helpful (0)
      • December 09, 2019

        5 2004 Mach 1 - pounder Installation Time: Less than 1 Hour

        coil pack upgrade

        I din't know how weak my 15 year old coil until I upgraded to the new Accel's. Best money I've spent.

        Helpful (1)
      • July 23, 2019

        5 2004 Mach 1 - Chrisjarrard Installation Time: Less than 1 Hour

        Accel super coils

        Great product! Car runs like a champ and it took only 20 minutes worth of work.

        Helpful (0)
      • April 03, 2019

        5 1999 Cobra - BenM Installation Time: Less than 1 Hour

        One small step

        Haven't started the motor yet but they do fit. More info when I get there.

        Helpful (0)
      • December 28, 2018

        5 2008 GT500 - Luis Installation Time: Less than 1 Hour

        Excellent Product

        Easy to install, improved acceleration, it's worth the money

        Helpful (4)
      • November 08, 2018

        5 1999 Cobra - Mike Installation Time: Less than 1 Hour

        Accel super coils

        The new coils work great. They were easy to install, and I immediately noticed more power.

        Helpful (4)
      • October 21, 2018

        5 2004 Mach 1 - Kel Installation Time: Less than 1 Hour


        Best thing money can buy... big power differents....

        Helpful (5)
      • October 16, 2018

        5 2003 Cobra - Terminator Installation Time: Less than 1 Hour

        Misfire problem

        Had engine misfire when going full throttle at lower rpms at track. Car is 15 years old and is mostly a track car so time and conditions had taken a toll on the original coil packs. Installed the Accel coils and tested at low rpms and found misfire corrected.

        Helpful (4)
      • September 04, 2018

        5 1999 Cobra - ChristopherR Installation Time: Less than 1 Hour


        They work great I have no complaints. They do what they’re supposed to

        Helpful (4)
      • July 21, 2018

        5 2003 Mach 1 - TimothyN Installation Time: Less than 1 Hour

        ACCEL Coil Packs

        In my opinion great product. Had these for about a year installed and they have been very reliable and consistent. That's all you can ask for with a good coil pack. I've seen reviews of getting one or two bad ones with other coil packs but these all worked great.

        Helpful (6)

      Questions & Answers (6 answers)

      5 Top Rated Questions

      Do you have to retune your car after installation? Car has pro charger with 9lbs boost , long tubes, and has been dyno tuned. It also has a long list of other mods.

      • The addition of these coil-on plugs will not require you to have your Mustang retuned. Hope this helps!

      Helpful (1)

      im interested in a set of these for my mach 1 I would like to know thee warranty these have on them

      • Accel (Holley Performance) covers these for 90 days. 

      Helpful (0)

      What is the warranty on this product?

      Will these coils be compatible with motorcraft oem plugs?

      • Yes, these coil packs are going to work with the OEM plugs.

      Helpful (0)

      How much morr horse power will i gain

      • We saw a curve gain of 10RWHP and 9RWTQ when installing a set of these Accel Super coils.

      Helpful (0)
      Post Your Question
      1 More Question
      What Kind of spark plugs do you recomend with this product. I have a 2003 cobra with a Jlt cold air intake , a 2.8" supercharger pulley and a sct custom tune that makes 457 rwhp. Just wanted to add a little more power. 2 answers

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (8) Coil Packs

      Tech Specs

      Will It Fit My Mustang

      • Cobra - 99, 01, 03, 04
      • Mach 1 - 03, 04

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