I had my TC done at ~90k, it was very noisey in comparison to the new one. My mechanic recomended I do the sprockets (cams and i think one more) as well because of the labor involved in removing the front timing chain cover to get at all the guides. The sprockets _were_ worn, and they would have added slop and accelerated wear in the new chain unless they were replaced. This job is such a pita that you don't want to do it EVER again-money for the sprockets would be well-spent i think.

Get the updated tensioner from MB as well. Are you doing the job yourself?

cheers,
dan r.

ps. Maddog! Are you dong the 2006 challenge? Good luck!