I have a 40th anniversary edition I purchased from the Denver area a few years ago. I live in the Dallas area and the exhaust has a small leak and is pretty rusty. I'd like to replace it up to the manifold. I have heard if this is not done properly (location of oxygen sensor) your OBD will start throwing codes. Can anyone recommend a competent shop in the area who'd know how to do this properly? Also, can anyone recommend some cost effective PN's for aftermarket mufflers and cats? I've hear Magna flow makes components that can work and are much cheaper than OEM.