Mine went in ok, it was a bit hard getting everything in the correct position but it did go in and I used the stock hangers for the muffler. I did drill new holes for the tailpipes. I can take some pictures if you need them.
Can you post a pic from under the car looking up at the muffler? I'm specifically looking for the spacing between the muffler and the fuel tank from end to end of the muffler.