This link will show you that the headers are about $975 and the cats about $300. They certainly deserve the discount that they get as a dealer. That leaves $125 for install plus their dealer discount on the headers and cats.
I would say you are getting a good, fair price. You are not being taken for a ride at all. I cannot speak about the quality of Dynatech though--no time to research that for you tonight.
http://www.secureperformanceorder.co...mer_truck.html