Brakes on your F-250 or F-350 can get overwhelmed, especially when hauling a heavy load. Thankfully, the variable vane turbocharger used on the 6.4L Powerstroke - normally used for creating a more responsive throttle and more engine power - can also be controlled to add some serious engine braking, taking the stress off the service brakes. You'll appreciate that at the next red light if you're towing.
The BD Diesel Variable Vane Exhaust Brake for the Powerstroke 6.4L installs easily and adds a rotary switch to mount on your dash to control the style of braking you get from the engine. Up to 130 horsepower of braking force can be added to your Super Duty by this BD Diesel Variable Vane Exhaust Brake.