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Chain stretch is a thing, although it tends to be minimal. That being said, I did not replace mine. I'll add - my engine is as quiet as a mouse now, with no startup rattles (primarily from vanos bleeding off oil) or chain slap. Prior it suffered from a 1-2 second startup clatter (and a big cloud of oil smoke from the OSV coupler being cracked in 2)
One of those things you'll need to assess once you're in there.
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