You may have a hard time getting this info regarding toda specifically but there is more than enough info on header building around the web. It's a fun project and I wish you luck.
Very nice do you have a sound clip?
I see is connecting directly to the header, so no test pipe or HFC?
So all pipes of the exhaust have 3 inches?
Is that a middle silencer there after the header?
And one more question, if the header has the collector of 2.5 inches why the exhaust pipe is larger than 2.5 inches and not the same size like the collector?
Is there any benefit going larger in the exhaust pipes, I mean larger than the header collector?
(I'm just trying to understand the engineering behind this)