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Contact us today to learn more about how we can help you get the most out of your 6.7 Powerstroke engine. The EGR and DPF systems are designed to reduce emissions, but they can also limit the performance of your engine. The EGR system recirculates exhaust gases back into the engine to reduce nitrogen oxide emissions. However, this can lead to a buildup of soot and carbon in the engine, reducing its efficiency. Similarly, the DPF system traps particulate matter in the exhaust, which can cause back pressure and r