I would imagine that the Akrapovic exhaust is the one to go for, although it’s not cheap.
I have a Duke 390 and the same issue, the Akrapovic is £500 ($800?) which is a lot of money for an end can on a bike that only cost £4,000
The CAT stays and there’s no need to alter engine tuning.
But it’s still too dear for me.
Also, take care as if you fit a decat pipe and/or aftermarket can, your insurance could be invalid if you don’t tell them about it.
Believe me, if you have an accident and they can find a way to get out of paying, they will.
Most insurance companies are fine with end cans, mine said it was fine, but if there’s a claim of “improved performance” they didn’t want to know and said l would need to “find insurance elsewhere” !!
Last edited by lightning; 07-03-2019 at 08:02 AM.