In my town we have a couple seasoned muffler shops that do this kind of work every day. So check around your area for an OLD muffler shop, shouldn't be a problem. You can also purchase a complete dual exhaust system from various vendors if you wish.
Best of luck


It's easier to get forgiveness than permission!
1946 1/2-Ton Chevy
1953 Chevy 3/4-ton Factory Stakebed