my exhaust silencer is starting to change colour near the link pipe end, is this a sign of the packing being worn out & if so where can i get replacement packing & sleeve?
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Akropovic can discoloration
It should polish off if you don't leave it too long, but as advised by jaffa90, you should ask the maker (I'd send them a photo to illustrate the concern).
Colour & cat?
What colour is it going? If it's purple/blue - and particularly if you've got a cat in there, it's simply heat cycling & will happen eventually over time - nothing wrong with the can!