1979 CB750KZ RC01 Correct exhaust driving me mad

[Mr Fixit]

Hi

Thought I'd posted this but cant find it so posting again!

I'm looking for some guidance as to what is the correct exhaust/muffler set up for the above bike.

Is it 4into 4 separate pipes
4 into 4 but fixed as 2 pairs
4 into 2 fixed into pairs

Thanks in advance

Oh and any HM or Sankei numbers would help!

 

[Skelee]

4 into 4 with 2 fixed. But it may have been modded.