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Penske Spec Miata Coilover System

Penske Spec Miata Coilover System

23993530 - PENSM
This is a fully assembled Spec Miata Penske based coilover kit. This is the legal kit for ALL SCCA National Level based competition. We only offer this kit in assembled form and if you'd like the components individually, you will have to source them from Mazdaspeed Motorsports Development. Due to the difficult nature of assembling this kit, we include a $150 assembly fee within the price
Kit Includes:
  • Front and Rear Penske SM shocks (you choose threaded body or non-threaded)
  • Mazdaspeed Motorsports Penske shock top mount and bump stop kit
  • OEM Mazda 99-05 Shock Hats machined to adapt the special top mount system
  • 5X Racing coilover sleeves (only if non-threaded is chosen)
  • Eibach 700in/lb springs for the front and 325in/lb springs for the rear (SM legal)
  • 5X Racing Urethane Spring Isolators/Shock Hat spring mounts (SM legal)
  • Availability: Built to Order due to assembly. Delays possible if we are out of stock on certain components
    Shipping: UPS Ground Domestic US Only. Free Shipping not available due to size and weight
    Pricing: $1,956.00

    Customize Your Item

    - Choose Shock Type -
     * required


    In 2019 the SCCA altered the rules for Spec Miata to accommodate a new shock package. After extensive testing, Penske was chosen to build a brand new shock created just for Spec Miata. These shocks are a fairly big departure from the Bilsteins we still love and use on our cars, but if you are planning to compete in National level competition, this is the spec shock and what is required to be used. If you're sticking with regional only racing, you'll want to check out the old tried and true Bilstein SM Coilover kits we also offer.

    With the shocks being so different from the Bilsteins, the only things that can be carried over from your Bilstein setup is the springs, coilover sleeves, and spring isolators. The Penskes have a special machined top mount that requires the OEM shock hats to be machined larger to accommodate the new top mount. This is extremely hard to do and will require a professional machine shop, or a very skilled person operating a drill press, with a very large bit. This is a big reason we only offer these as fully assembled, because it's not something the garage-based enthusiast can accomplish as easily as the Bilstein SM coilovers.

    There is also a choice between "threaded body" (version 2) and "non-threaded body" (version 1) shocks. The reasoning for this is because it was found that the Eibach springs were rubbing on the coilover sleeves on the version 1 shocks that reused the slip-on coilover sleeves of the Bilstein kits. Penske created a revision (version 2) that has built in threads on the shock body and a special locking collar/spring perch system. This was meant to cure the rubbing issue, but we hear it is still an issue. While the version 2 shocks are nicer in appearance and "racy'er" looking, the version 1 shocks are more affordable by about $250 in the end, and it's said that the version 2 shocks still have the spring rubbing issue. You be the judge!


    • 23993530 - PENSM
    • 23993530
    • PENSM
    • 5X Racing
    • Built to Order due to assembly. Delays possible if we are out of stock on certain components
    • New


    Shipping Information

    • Item Requires Shipping
    • 30.0 lbs.
    • W10.0000” x H10.0000” x L24.0000”
    • UPS Ground Domestic US Only. Free Shipping not available due to size and weight

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