The experience In had with the installation of fenton headers and an exhaust system are as follows. Big name shops (3 different ones ) Bend over buddy we will take care of you, super duper 2 1/2 inch alum pipe, Flowmaster mufflers, $600.00- $750.00. I told them small metal pipes cheap mufflers, They couldn't do that, that's not what I needed.
I went to flaps, bought some straight pipe, couple 90 degree turns 2 cheap mufflers and a couple of hangers. Put this on the truck and went and found a guy working out of an old gas station in a nearby town. For less than $200.00 he welded up a set of pipes, bent them over the rear end and out the back. I now go to him whenever I need anything, and send people his way whenever I can.
Moral of the story, Find some independant guy who wants your business and give it to him. Let the fancy shops do what they do to all the young kids that want to say I have ----- to impress someone.