Pacbrake says Jacobs is full of it
http://www.pacbrake.com
That will answer all your questions. Note they have a special "kit" for the
'05s. The problem with the '05s is the ECM no longer has the exhaust brake
function turned on (those DC bastards turned it off), so the kit uses a
micro-switch on the pedal instead (so, when you lift off the pedal, and the
brake is armed, it will engage). Note that they also use the ATS Commander
transmission controller, which is EB-aware, and will keep the converter
locked while the exhaust brake is on (until you hit a pre-set speed, then it
will unlock).