I have had a BD Exhaust Brake on my 94' since it had about 35,000 miles. It now has 150,000. You will need to have the ability to keep the TCC locked in order to make the brake effective. This can be done with the small computer boxes others have mentioned above, but you can also install a switch that will allow you to lock the TCC simply by flipping the switch.
Personally, I would not want a Diesel pickup with out an exhaust brake.
Wayne
amsoilman