Do you think I should spend $2600 and add exhaust brake?

OP, in the end obviously the decision is yours to make. In my case I decided not to spend the money on my 07, just decided to trade it on the truck in the signature. We recently took a trip with it to Branson through the Ozark hills and the EB was awesome!! Next month we go to Virginia Beach and will pass through the Appalachian mountains. I hope to be grinning all the way down hill!!! Please let us know how your trip turns out.