What about 848 Boom tubes?
I did a set years ago for a 748. Given the lower fairly belly fairing on the 848, I'd create a different outlet opening scenario to integrate into the 848 hyperbike design language better (than the twin round outlets)
Only questions to be address would be:
1) how can the ECU be adjusted to correct for the possible air/fuel change?
2) does the 848 have the flapper valve in the exhaust ala the HyperMotard and 1100 series Monster?
3) remounting / shortening of the license plate bracketry
4) what tabs/brackets extend down from the tail subframe to support the exhaust?
Building the actual exhaust is the easy part to be honest.