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I think the damage is this part, should i replace it?
If its a deep gash (looks like it is), just replace it.
Risking driving on a tire with a weak sidewall could cause a blow out when cornering, which is incredibly dangerous.
As long as the metal wireframe under the rubber is not exposed I don't see a reason to replace the tire.
You will want to monitor tire pressure over the coming days and weeks though.
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