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I've had the JBD diesel tuner for about a month and drove about 1,500 miles with it. After I installed it, I felt a big increase of power. Driving on the highway, you can easily go from speed limit to 90+ mph with just a small push on the gas pedal. No, it won't make it a diesel M3, but it will definitely increase the power you feel.
I don't know how it compares to a tune, but IMO, it's a good deal for some cheap horsepower.
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