I've had my small-silencer Ragazzon "alfisti.net edition" centre section put on now - leaving me with a small centre box, small transverse rear box, and quad exits with no silencers on them. Standard cf3 cats still.
I've only driven it about 3 miles so far, but first impressions are good, a nice growl without being too loud, quite a fat rumble at idle, but definitely some drone in the cabin between 1500rpm and about 2500rpm. Taking it on a city/A-road/motorway journey tomorrow, so after that I'll have a better idea of whether it's going to be annoying.
Also seems to be more of a kink in the torque curve now, a bigger shove-in-the-back feeling when you hit the powerband. Whether that's because it more free-flowing at high rpm, or because it's actually down on power at lower revs now, I'm not sure. Hopefully the former. Probably ought to be remapped, I suppose.