I'm slowly piecing together a 3" exhaust on my '72 Dart big-block. So far it's ready to be TIG or MIG welded (by someone who can weld far better than I can) back to the rear extensions from the X-pipe kit.

How many hangers should I use, and where should the pipes be suspended?

At the front the headers will support the exhaust system. The X-crossover is difficult to hang since it's centered under the driveshaft. I think the body originally had a hanger at the outlet of each muffler, and the tailpipes near the bumper.

Thanks for any hints.
-Charles