If you did it yourself or had a shop do it, how long was the job??? The estimate i got from my regular muffler shop was 6 hours total (to be safe) There was a website that did the dynamax install "how to" and also gave a dyno graph for the before and after. That page said it took 3 1/2 hours. I went to a different muffler shop today that said they'd do it for me no problem. The people that worked there drove rams (no hemi's) so i didn't worry much about it. I dropped it off at 10am, they had me and some excursion only for today, and they were about an hour away from being done with that truck. I just got off the phone with them (3:20pm) and the guy said they only have one side on!?!?!? how much of a bitch are these headers to get on/off??? I'm guessing they didn't take the "easy" way out by removing the front two tires and fender well trim, but is that a long time or just me? They close in 1 1/2 hours and if keeping the truck over night is out of the question. I had told the guy that to begin with and he assured me it wouldn't take that long and it would be out today... kinda strange.