I'm a Blue Flame fan (oval, stainless, twin spout) - long lasting, good looking and good noise, adjustable from nice to louddddd.
And best of all, cheaper than most other exhausts I've seen.
We've got them on both Faxer's and my RSV - I reckoned that if it could stand nearly 20k mostly high rpm track miles on my RSV V-twin and be as good as new, then they'd be fine on the Fazer's.
So far, so good.