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As a result, many companies offer DPF (Diesel Particulate Filter) back exhaust systems. These remain street legal and can free up a couple extra horses. For those who are planning on using their vehicle off-road, whether it is at the job site only or track, and/or anywhere off road, Elite Diesel Engineering has another option. While there are ways of reducing the power needed to work each of these, they are usually reserved for performance-oriented applications. For example, removing a water pump wil