upmap have not 959 map to download in mobile ,they maybe have the map to download soon.
Yes, you can swap to the Akra underbelly exhaust. Just make sure you buy the one for the 959/1299 since the header size for the 959 was increased to 60mm (compared to 55mm on the 899). Having said this, you also need to swap the lower fairings in order to accommodate the underbelly exhaust.
That is I'm aware. but if I use my stock headers and only use the US spec end can do i need the "Y"pipe also from US spec or can use euro spec Y pipe?You'll also need to replace the lower fairings, the ones for EU exhaust are different.