While some enthusiasts appreciate the updates, this particular change has sparked debate and drawn some criticism.

Much of those profits came from the sale of diesel engines for consumer and commercial use, including the 6.7-liter turbodiesel inline-six. The 6.7-liter Cummins has been around since 2007 ...

Called the B6.7 Octane, Cummins' first gas engine is a turbocharged 6.7-liter inline-six that runs on 87-octane gasoline. Output ranges from 200 horsepower and 600 pound-feet of torque to 300 hp ...

For years, Cummins fans have wondered what a gasoline version of the legendary 6BT would look like. The original 5.9-liter I6 ...