how many miles is too much for a used intake

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Intakes don't wear out over time. Assuming there aren't any mechanical problems (i.e. it's physically broken), 10 billion miles wouldn't be too many. If it's pretty dirty (inside or out), get it cleaned up before installing.
 
It's not a wear and tear mechanical part so I don't think it matters. The worst could be stripped threads or excessive carbon or oil build up which is no big deal to clean.