There’s a custom bike shop near me doing a YouTube build series on a a Supermoto inspired Vitpilen. You’d probably like it, they’re called Purpose Built Moto. They go into a fair bit of detail in the videos
yes, its stock oem exhaust from 2015-2016 Duke 390 exhaust, yes it needs a little bit modification by cut off the upper vitpilen exhaust mounts also required header from 390. other than that, direct bolt on. i like it more cleaner look than regular side mount exhaust.