1980 something CB750 I just got last week. I want to switch to a 4-1 exhaust any suggestions?

https://i.redd.it/3pbegytq26l41.jpg via /r/CafeRacers https://www.reddit.com/r/CafeRacers/comments/fep4gz/1980_something_cb750_i_just_got_last_week_i_want/?utm_source=ifttt