Yup, already orders a new 2016 header.
There is nothing much for the 2017 model in the market right now. from my research, there is onli 1 akara carbon slip-on.
There are tons on MotoSxxxx website, but i doult its going to fit.
so switch my 2017 model back to a 2016 exhaust setup
Well i just bought a 2017 RC390 1 month back... i just ordered Product ID: 90805999000(the one with the cat connector) from KTM TWINs waiting for delivery. not sure if its going to fit. but i guess it worth a try, worst case just use it as a slip on backend if the cat cannot fit.