We've got Blue Flame's (twin-spout, oval can) on both Fazer's and on my RSV.
Easily fitted, well made, road legal (with removable baffles and end plugs for various increases in loudness) and around £160 direct from Blue Flame.
We didn't go for the fancy carbon or coloured/titanium type finishes, but if you look at my posts of the bikes, they're good looking cans - IMHO they can't be beaten for value. If I didn't have a full stainless Remus system on my FJJ, I'd defo have another Blue Flame can on it.