Beginning in 1994, there's a jump in horsepower and torque, and that gap increases further depending on whether you have a manual or automatic transmission. For a Cummins 5.9L from 1994 to 1995 ...

at 325 horsepower and 660 lb-ft of torque. The original 6.7 Cummins diesel engine features the same inline six-cylinder arrangement and cast-iron construction as the 5.9-liter diesel it replaced.

If you can believe it, their 160-horsepower and 400 lb-ft of torque rating was class-leading performance. The Bosch-built fuel-injection systems found hanging on 5.9-liter Cummins diesel engines ...