Are you talking about the EBP? It is not an exhaust brake. It is used to warm up the engine during a cold start. I live in Arizona so I removed mine. I also visit Family in Flagstaff during the winter at -10 degrees and I do not have a hard time starting my truck. Now since the removal of the EBP when I visit my family up north it does take quite a bit longer for the truck to warm up.
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