Prevent excessive wear, and costly unwarranted repairs on your braking system for your 2006-2007 Dodge Cummins 5.9L, with a BD Diesel Exhaust Brake. Using variable butterfly technology, the BD Diesel exhaust brake provides peak retarding power throughout the engine′s entire rpm range. Also with a constantly exercising butterfly, carbon and rust deposits are reduced dramatically, providing miles of maintenance free service. The exhaust brake is controlled by a lighted on / off toggle switch or an optional stick-mounted rocker switch for manual transmissions.