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The Reaper programmer from Punisher Performance utilizes the EFI-ILive Autocal platform to give you the best custom tuning options in an easy to use handheld programmer. Punisher Performance has spent hundreds of hours adjusting and fine-tuning these programs to ensure that your Duramax LML will see the best and safest gains in power, torque and fuel mileage.
These tunes are appropriate for Duramax LML diesels with stock engines and transmissions. There are three different power levels pre-programmed on the Autocal so you can choose the tune that meets your specific needs. Choose from a Tow tune, a Fuel Mileage tune, and a 500 Horsepower Race Tune. 500 Horsepower is the maximum recommended power level for a stock transmission, turbo and engine. If you want to make more power than that, Punisher Performance can design a custom tune based on your further upgrades.