The end tips are machined aluminum as far as I can tell - I've got a carbon fiber set in pieces at the moment. Preposterously loud as I've mentioned before...Definitely Sil pipes, these end cans are probably the more expensive Titanium variety(which is only the 4 end cans, not the actual pipes which are stainless steel), as far as I know they came in CF or Titanium. Back when these first came out they were usually fitted with a Power Commander which is a fuel air adjusting piggy back on the ECU.
The Titanium can sleeves can be colour anodised if you wish, I have seen them in various colours. The tips can also be chromed if that is your thing. In my opinion they are not to loud, not like a Bodis system. Sil sound on full thrott:
My F4 750 is fitted with these and a PCIII. Chris at Xbikes dyno'd my bike with this set up to help tune it, but what can be done is limited. My bike is still a little snatchy in first, a Micro-tec ECU is the best solution.
Not sure if your pipes have been altered in some way, or we just differ on our view of loud, when I ask my friends they don't think my Sil pipes our really loud, nor does the chap who does my mot(British annual compulsory vehicle safety check), thankfully it is currently at the testers discretion as to allow naughty pipes, he say mine are ok but their is a chap with a Harley who he won't pass.Preposterously loud as I've mentioned before...
I can't tell very well from those pics, but I have seen quite a few of the old bikes with that tatty look to the casings, I put it down to general age unless they have been lucky enough to be stored in ideal circumstances. The other bikes I am talking about have generally looked ok, it's just the casings that get tatty, were all getting old.Florida or other high salinity environment perhaps. Or just stored in a damp shed. Without pics we're just guessing, so post some.