If you're searching for information about the Cummins 4BT diesel engine and how it differs from the 6BT, you likely fall into one of three camps. Camp one enjoys reading about obscure diesel engines.

You're driving a loaded diesel rig down a mountain pass, foot hovering over the brake pedal, heart racing. How do you slow 20,000 pounds safely without cooking your brakes? Cue the exhaust brake -– ...