…I will add something more.
to put the RZ right hand on you need to change the rear shock bolt with a longer one.
Then sooner or later or maybe from the start you will have some problem with the rubber muffler support.
You could change it with a 3 - 3,5 cm long alu cylinder of about 1,5mm diameter where you can pass trough a screw - bolt of 5cm.
Or better let somebody do a weld job.
If all this sound too mutch, go for the PM tuning (but left hand), with this exhaust you will have a little less power in comparison with the RZ you will loose about 2hp between 7000 and 8000 - 8500 rpm but you will have a better power spread at low mid range.
But if your engine is mostly a daily rider and occasionally touring a SITO plus will be a good one.
None of the expansion exhausts will give you as much power as the Sito plus at low, low mid rpm, and global drivebility. I loved it with your set up (I say PM tuning as a the best global compromise daily - touring - and sporty)
But if you often stay beyond 5500 rpm then there is not comparison.