That depends on the shop too, I to it to one shop to get a quote and they wanted over $500 dollars to do a header back exhaust and that with me putting on the header and I had to bring it in with no cat. THwy said they couldnt take the cat off if it was in working order. The place I took it to said it didnt matter. I ended up taking the cat off when I put the header on anyway, becasue it was all connected and I didint have acces to a cutting tool. I drove it over the the exhaust shop with just the header, man that was loud. I had to roll the windows down becasue fumes where coming up through the holes for the shifters.
So ask around, some times if you tell a shop the quote from another they will beat it by a little. That is what the guy in town did I actually told him what it would cost em to do the Calmini kit and he quoted me just under it. Good luck
Jacob