The Car was originally fitted with the following muffler and it is was not from Honda so I threw it away once the Engine started to breathe.

and shifted to the the following one, it had a unique deep sound at high revs only but still it was loud so replaced it as well

Then I got Honda OEM 92~95 civic exhaust but the my mechanic told me that it was not for the EFI car so I returned that as well.
Then finally got hand on the following exhaust, it is from FUTABA for HONDA an OEM product. It is super silent, fits well in the rear, looks good and perform well too. Probably it has got a bypass gate.






Regards