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2006 Dodge Ram 2500 Cummins Fuel Pressure Box

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The idea behind stacking is that not only will your truck benefit from the new programming, but also the inline fuel pressure box will intercept those signals and produce even more power. Another advantage is the ability to turn one or both modules off, allowing your rail pressure to return to stock and conserving injectors and fuel.
2006 Dodge Ram 2500 Cummins Power - Power Atop Power

The idea behind stacking is that not only will your truck benefit from the new programming, but also the inline fuel pressure box will intercept those signals and produce even more power. Another advantage is the ability to turn one or both modules off, allowing your rail pressure to return to stock and conserving injectors and fuel.  View Related Article