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Sales & Service Hours

Sales & Service Hours

Customer Service

  • Monday to Friday: 8am - 6pm EST
  • Saturday/Sunday: Closed


  • Monday to Saturday: 8am - midnight EST
  • Sunday: 9am - 10pm EST

DiabloSport Marathon

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    • Compatible with GM Vehicles with Active Fuel Management
    • Drops Cylinders to conserve fuel
    • Save fuel by keeping vehicle in AFM mode 80% of the time versus factories 35%
    • Easy install, plugs into OBDII port

    Getting great gas mileage in your truck is easy to achieve with a DiabloSport Marathon! This bad boy uses your existing Active Fuel Management to its fullest extent, by having you truck run on its cylinders 80% of the time. That is an insane percentage, being with stock the AFM is running on your cylinders only 35% of the time

    DiabloSport Marathon will be saving money left and right. It installs simply by plugging into the OBDII port within a matter of minutes! So if you like saving money and getting great gas mileage, then the Marathon is for you. So what are you waiting for? Get yours ordered today!

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    1 Year Warranty

    DiabloSport warranties the Marathon for 1 year. This warranty protects against manfuctureres defects and workmanship. If you have any other question please call out amazing customer service.


    This install is as easy as them come with no tools needed and easy step by step instructions. All you have to do is plug your DiabloSport Marathon active fuel management  device in to the OBD-II port. If you have any other questions please give us a call at 877-216-5446.