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The electronic control module (ECM) of a Ram Cummins diesel truck can be modified by a tuner to improve performance. The advantages of using a tuner, such as improved fuel economy, longer engine life, and higher horsepower and torque, are discussed in this guide. Handheld and custom tuners are the two main categories, with custom tuners providing more extensive changes. Before buying a tuner, it's important to think about compatibility, brand reputation, and tuning capabilities. It is worthwhile to spend money on the appropriate tuner for your truck's unique requirements because a properly tuned truck can reduce fuel and maintenance costs.