Any of the 2-2 systems including the Renegade ones are like the proverbial rocking horse muck, very rarely come up second hand and are very sought after. The Akrapovic SBK 2-2 systems that came on the Haga and Edwards reps are even rarer and usually go for silly money. Arrow systems are likewise.
However, if its a 2-1-2 system your after, these including the Giannelli and the Renegades appear on the market a bit more often but are still sought after and command a good resale price. I blagged my Renegade high mounts a few years back for £250 which was an absolute bargain at the time. I'd still make that back today if I put them on eBay. I'd say gizgreys Giannellis would be about the same. What I can say is that the Renegades sound absolutely awesome run as they should be - with no baffles in. :biggrin
Jorge from Renegade apparently headed back to Portugal and still makes exhausts but the last time I looked they had no website up and running. The Renegade 2-1-2 highmounts came with three end can flavours - Titanium, Carbon and Stainless. Titanium ones command a slightly higher price than Stainless ones. I've never seen Carbon ones for sale on the used market, not many folk opted for them from new as the exhaust pulses from V-Twins will destroy carbon cans rather quickly. :thumbup