Upgrade exhaust system or just replace mufflers
I have a 1977 Argosy 24' Motorhome with the Chevy 454. Both of my mufflers are rusted out. The remainder of the exhaust system from the headers to the tip of the tailpipes is in pretty good shape. There is significant surface rust, but I can't find any soft/weak spots. I'm not sure if I have any leaks at the headers or not - probably so since these are the original cast iron headers.
I have to replace the mufflers. I can buy replacement mufflers like the originals for just under $200. Problem is the oem mufflers have a 2.5" input and 2.5" output.
I would like to replace the exhaust system with larger ceramic coated headers with a 3" collector, and run them into a 1 in 2 out muffler with dual 2.25 tailpipes on both sides. This would cost me an additional $400 - $500.
Is it worth spending the money to upgrade, or should I just replace the mufflers and call it a day?
Thanks for your help!