RE: Looking for something a little louder!
The price is a little high, but you're going to have a tough time finding a garage to do this kind of work in the NJ/PA area. (You know, getting the 3rd cat cut out and making the pipes...........I know, I tried). There are a ton of people on this board that drove hours to Mufflex to get the work done. They have probably done over 100 Mark VIII exhausts. They did mine.
Even if you purchased Dan's (which is a great price and a great product), you'd have to pay for shipping and installation, which would bring you to within $100 of Mufflex's price.
Based on convenience Mufflex is the way to go, especially working in the same town they are in.
I'm assuming their price is higher because they are making the pipes right there, vs. a pre-fab set-up. (not that this would make the exhaust better)
Ken