I'm after a set of CF cans too, for my SP4. What's up with those you already have? If they're 'decent', and you wish to sell, I may be interested in buying.
Nothing.I am just doing a bit of experimenting and don't want to butcher the originals.I ma going to make a spaghetti/nest of vipers set and try them against the originals.Thats why i'm after headers,both 45 and 50mm as it will be easier to cut the pipes and weld in sections.
proper vipers do cost a few quid. there are several different size and fitting configs about. Make sure you get the right ones etc. The set of vipes and pipes I had on my 851 were proper corse items, of an early race bike, as such were a good upgrade on the bike, but some of later systems use larger than 50mm diameter pipe. also the silencer pipe length can vary quite a bit.
I paid £600.00 (and that was used) just for the nest of vipers last year, let alone the silencers etc. you may find it cheaper to buy a proper set in the long run.