I've had 4 different cans on mine over the years. A Blueflame twin-outlet oval in stainless ... looks matched the bike well and sounded good. Then I scored another Blueflame, a tri-oval titanium job which never looked right on the Fazer, IMHO.
After that, a Mivv GP in carbon - great sound, not too loud with the baffle in, and matched the rest of the bike's style nicely.
Now it's got the oval Akra titanium - part of the full system exhaust - which is about 2" shorter because I had to modify it after a minor mishap. I like it best of all.
I think the older style cans works best with the Fazer, which is itself a well-old design now. The more modern hexagonals and other cut/slash-styled cans look out of place but that could just be me being a bluff old traditionalist
