I know what you mean Mick, but original pipes are difficult if not impossible to get.
Even an aftermarket set would cost close to a grand.
If I can get another CB500 to recommission, I'll be somehow trying to get 4 exhausts fitted, but I won't be paying silly money for them - I'll try to make them up on a budget.
At least the ones that are fitted now are much more solid metal than the original silencers.