Will this kit work?

Why not find another shop and tell them exactly what you want. I put my own exhaust together on mine. I made templates out of cardboard from the header over through the crossmember and back a little. I took the template to the local shop and we bent the pipe. I brought it home and welded it all together to the back with turn downs ( even made those too while I was there) stuffed it under there and it works great. I have about 60 bucks in mine.