Eldon,
I bought mine at the muffler shop where I had it installed. They welded it in place, along with a custom fitted Y-pipe, to my existing cat-back system (which they also installed). This is a local shop - not a franchise - and they do quality installs (real craftsmen). I can't speak to the ease, or difficulty, of this job. It's REAL easy when you pay someone else to do it. :lol:
They charged me $225 for the Magnaflow cat, plus $125 labor for the Y-pipe and cat. This was 3 1/2 years ago, so I don't know how much the price would have changed by now. The part number for the converter was 94019.
I would recommend this mod if you already have the setup you've got. You'll love the deeper exhaust sound it'll give you.