I have done a bit of reading about tuned systems. Problem with the FZR is it has a common chamber
so can’t really be tuned. So I was thinking about how to have a separate pipe for each cylinder but preserve the Exup.
I found this diagram of the 750 exhaust which has individual Exup valves for each cylinder.

It still has a common chamber after the valves but I think a rear flange could be made up
to lead into separate cans. This then would permit the length of the exhaust to be tuned.
Wondering if anyone has attempted this and if so that results were obtained?