Most full service Muffler Shop.
I found Austin's in the Dex business pages. Just over the phone I got a great friendly feeling. I had already called my Nissan dealer and they had quoted me approx $1,000 as it was not a simple repair. I drove to Austin's which has been in business for 30 years. This shop bends pipe and makes parts custom for a muffler system. He told me that he could put on a new muffler on, but all you needed is a new 8 inch section of pipe welded in. Well 20 minutes and $60 later I was fixed. Austin's have made a customer for the future.