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If you tow heavy and don't have an exhaust brake, truly, you're missing out. One of the great things about a diesel engine is the ability to retard the engine, slowing it down through the engine instead of solely relying on the truck's service brakes that can easily overheat on a long grade. BD built its reputation on exhaust brakes starting in the early 90's with many casting designs for both engine and remote mount air actuated systems. Rugged cast-iron bodies with an offset stainless steel butterfly build peak efficiency quickly. When you're ready for safer towing, upgrade your truck with a BD exhaust brake.