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Burning legs and extremely hot butts were the norm.
You don’t need to worry about muffler design with side pipes. You don’t have mufflers. Just baffles in the pipes.

That is nonsense .... side pipes do not run as hot as the collector, the further down stream the cooler the temps.

Side pipes can have augers, baffles, and believe it or not mufflers.

I personally prefer just a nice big open pipe, from header to exit.
My wife’s uncle is building a dodge brothers Truck rat rod powered by an old industrial HEMI and set up his exhaust much like your picture. His side pipes are 3” tractor stacks off of a John Deere tractor Which come out right behind the cab. He was going to run them open, but opted to slip a glass pack inside the stack so that it won’t sound like a tractor.

The old industrial HEMI is cool, but it is a low compression constant duty engine off of a water pump that he converted to run on the street. I don’t think it would sound all that great if left open with no baffling at all.

The pic attached isn’t his, but is very similar.
 

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