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JD Customs U.S.A

JDC Coil-On-Plug Ignition System | Refurbished Denso Coils (Evo 4-9)

JDC Coil-On-Plug Ignition System | Refurbished Denso Coils (Evo 4-9)

Regular price $350.00
Regular price Sale price $350.00
Sale Sold out
Shipping calculated at checkout.
Mounting Plate
Wire Harness

JDC Coil-On-Plug Ignition System | Refurbished Denso Coils

Refurbished coils are getting harder to source and our inventory fluctuates. If you would like to check our current stock before ordering, please email or call us at 423-665-9616. Purchasing a kit with new Denso coils is recommended since we keep those in stock at all times.

Ignition systems with new coils can be found by clicking here. 

Suffering from spark blowout issues on your underpowered OEM coils? The JDC Ignition System is what you need! The JDC Coil-On-Plug Ignition System is a direct replacement to your factory Evolution 4-9 coils and ignition wires and simply plugs in and bolts down! No assembly is required to replace your bad ignition coil set! Simply remove the setup from the box and install it on the car. This system utilizes 100% authentic high performance, Japanese-made Denso Ignition Coils, not the cheap off-brand coils that won't perform as well or last as long.

The JDC Coil-On-Plug Ignition System is made in the USA. These systems are guaranteed to perform the same as SparkTech/ Spoolin' Up non-CDI systems! The JDC systems have been on the market since 2015 and have proven to be one of the best-performing and reliable systems out there!


  • Works with all Evo 4-9 USDM/JDM models (select the correct option according to the valve cover you have. Evo 9 with MIVEC is different than Evo 4-8.)
  • This ignition system is¬†designed for use with the stock ECU and is compatible with AEM EMS V1 & V2, Haltech, MegaSquirt, and the SunAuto Hyperforce. This system will NOT work with CDI boxes or the HKS DLI¬†and is not needed to meet your power goals up to 913whp+.¬†


  • 2 Year warranty¬†on Refurbished Denso coils
  • Lifetime warranty on wire harness and mounting plate
  • Fits under OEM spark plug cover and most aftermarket covers
  • Tested to 913whp @ 0.020" spark plug gap¬†
  • Military spec wire sheath, rated to 428degF
  • Military spec tefzel wire, rated to 393degF
  • Waterproof seals on all ports
  • Plug and Play (no assembly required)¬†
  • No retune needed after install
  • Gain 8-20 HP/TQ (mod dependent)
  • Greatly reduce or eliminate partial throttle bucking
  • Better overall idle quality
  • Quicker and easier start, especially in colder weather with E85
  • Run more boost without spark blowout issues
  • Run more gap for better fuel burn and increased mpg
  • Plugs last longer due to less fouling
  • Makes changing plugs extremely simple
  • No problem-prone CDI boxes to worry about
  • Choice of satin black anodized 6061 billet aluminum, solid carbon fiber, or Titanium mounting plate
  • Choice of standard or "Hideaway" wire harness
  • Choice of¬†stainless steel or titanium hardware

    What's in the box?

    • Assembled JDC Coil-On-Plug Ignition System
    • Mounting Hardware
    • 15A Fuse
    • QR Code for Online Instructions

    About the Hideaway Harness Option:

    • This harness uses the same high-quality connectors, military spec tefzel wire, and wire sheath as our standard COP ignition wire harness, but this one hides under the mounting plate for a super clean, wire tucked look! This harness offers the same quality and performance as you'd expect from any product offered by JD Customs USA. This harness is sold separately or can be added to any of our ignition system options for an additional $30.¬†

    How is this harness different?

    • Both leads come out from the valve cover on the right side and are concealed by a single plug wire sheath. The right-side connector makes its hidden connection behind the thermostat housing and the left side lead can be run under or over the intake manifold to make its connection behind the valve cover for another hidden connection. Click¬†here¬†for more info on the "Hideaway" harness.¬†

    Installation Instructions:

    Warranty Information:

    • Refurbished Coils- 2 years
    • Wire harness & mounting plate- Lifetime
    • Warranty only applies to the original buyer and is non-transferable¬†
    • Warranty does not cover water damages or any other abnormal issues due to improper maintenance or care.


    • Please allow an average of 1-3 business days for your order to ship. (This is an estimated time and may take longer depending on the size of your order.)
    • Titanium mounting plates will come standard with our burnt finish. To request a certain color please email us before purchasing. Please make sure to only clean them with¬†Windex and a microfiber towel or a Clorox wipe. Harsh chemicals and polishes may tarnish or remove the colored finish.

    There is a nationwide shortage of refurbished coils at the moment, but new coils are readily available. We will process all orders in the order they are received but there may be delays. Please reach out to us if you need the system by a certain time to verify stock. We will not reach out to let you know an ETA as we do not have one!

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