I had my local camping world quote me $900.00 including tax to install an exhaust brake. This includes the part. They said $699 for the parts and $148 for installation and then some tax. This sounded very reasonable to me, I was expecting more. In fact, I am concerned I am missing something. Does this seem like a fair price? Can an exhaust brake cause engine or transmission damage particularly one that is 15 years old with 127,000 miles? We are heading west in a couple of months for the first time and I decided I would feel much safer with some sort of additional braking.