Dual exhaust system

[leekvanli]

What is all envolved in converting a single to dual exhaust system on a 1963 Pontiac Catalina? Are kits available?

 

[melsg5]

see if this is what you are looking for
https://www.opgi.com/catalina/1963/exhaust/exhaust-systems-kits/

 

[Zimgxp]

Check with an Exhaust shop too.