Not sure if this has been discussed, wondering what Duke 690 silencers will fit the 701. As far as I can tell many of them look very similar, im not super excited about any of the options currently available for the 701.
Side note, I recently bought a 690 Duke decat from Leo Vince that fit my Svart701 perfectly, the 690 decat was $40 less than the 701 but had all the same part numbers and looked identical.
For the slip-ons, the upper mount location is different, so if the can has a sliding band clamp style mount and not a welded or riveted upper mount then you can adapt it. But the other conflict is the peg/rear brake MC clearance since the pegs are much further set-back on the Pilens. The other issue is suspension linkage clearance under the swing arm at full droop/extension. Some larger diameter slip-ons will not clear.