For the 2003 model year, the Cummins was introduced with Bosch high pressure common rail fuel injection, again increasing power output. Midway through the 2004 model year, the Cummins 600 was introduced, producing 325 hp (242 kW) at 2900 rpm and 600 ft·lbf (813 Nm)at 1600 rpm. This high torque output gives the engine its name, and also offers a high specific output of 102 ft·lbf (138 Nm) per liter of displacement (1.67 ft·lbf/CID)
A 610 version, new for the 2005 model year, pushes torque to 610 ft·lbf (827 Nm).
