If i were to get an exhaust brake could i buy one like this http://cgi.ebay.com/ebaymotors/CUMMINS-EXHAUST-BRAKE-by-JACOBS-NEW-IN-THE-BOX_W0QQcmdZViewItemQQcategoryZ42610QQihZ013QQitemZ230153467609QQrdZ1 or does it have to be something special what would i have to upgrade to do that.