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Marathon Active Fuel Management Module - M1000X

Suggested retail: $252.00
Your Price: $225.95
  • Due to growing demand and increased order activity, please allow for 1 to 2 additional days for online shipments.

    In Stock. Orders placed by 2 PM MT, with the exception of weekends and holidays, will ship the same business day. Please allow 48-72 hrs for 2015+ Chrysler PKIT and PCM products. Want to Buy Now and Pay Later? Click Add To Cart and see how you can spread your payment over 3, 6, or 12 months with Affirm


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    Orders placed by 2 PM MT, with the exception of weekends and holidays, will ship the same business day

    The DiabloSport Marathon Module helps you get better fuel mileage by enabling your V8 engine to behave like a four-cylinder engine when cruising, while still allowing for full V8 power when you need it.

    Easy installation. Just plug into the OBDII port under the dash and drive.
    Compatible with GM vehicles built from 2005 to current that feature Active Fuel Management (AFM).
    Enables vehicles with AFM to drop cylinders in order to suit the driver\'s power requirements, while conserving fuel.
    Saves fuel by allowing vehicle to stay in 4-cylinder mode 80% of the time as opposed to only 35% from the factory.

    Pending 50 state legal emissions.

    Not available for sale or use on pollution controlled vehicles in the state of California.

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    Questions about buying this product? Our experts are available from 8 AM – 5 PM MT. Call today at 866.404.6141. Our sales team would be happy to answer any questions you have.

    This part is legal under the provisions of EPA’s memorandum 1A. The company has reasonable basis (test results) to verify that this product allows the vehicle to operate within legal emissions standards and is therefore legal to be sold for on-street use in all states that accept the legal provisions of the Clean Air Act and EPA Memorandum 1A. This product is NOT LEGAL FOR SALE OR USE IN THE STATE OF CALIFORNIA. Testing with the California Air Resources Board, in order to achieve 50-state compliance, is pending with CARB. Once testing is complete with California, and an E.O. number is issued, this product will be updated to 50-state legal status

    Marathon Active Fuel Management Module is rated 4.0 out of 5 by 2.
    Rated 4 out of 5 by from It mostly does what intended. This works well for flat roads with no wind. If you use it on rolling hills or steep hills the gas mileage remains about the same as without the chip, and if you add wind, even to flat roads, you definitely lose your advantage, but for the flat stretch that we typically drive we are seeing an improvement of about 5 MPG on average.
    Date published: 2019-01-13
    Rated 4 out of 5 by from Slight improvement in mpg I see a slight improvement in average mpg. I know some of their other products can be updated. If this can I suggest making it go to V4 mode at idle and up to 1,200-1,300 RPM. Since there’s no hesitation in going to V8 mode when you STEP on it I don’t think a update like this would be a problem.
    Date published: 2018-11-28
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    Does the I-3 can tune the Active Fuel Management to work more efficient???

    Asked by: Lupillo

    Is it possible for the Marathon to be updated to switch to V4 mode when the engine is at idle, and in stop and go traffic at 5-10 mph or 1000-1,200 rpm?

    Asked by: Robert2010

    Will this work in conjunction with other diablosport tuners?

    Asked by: Jedi0621

    Will the Marathon module work on an 08 Cadillac Escalade EXT? AFM was not included on these engines until 2010 so it's not standard or tuned from what I've researched. 

    Asked by: Inygmaz
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