Ultimately what you really need to think about is what are the wear characteristics for the part. Charge pipes or headers have no moving parts other than those that flex so I would feel pretty comfortable with going used if the pricing looks good. My main concern would be around missing/worn pieces or user-induced damage due to improper installation. That said, for a $350 part I would just go with new as it'll come with new seals and flex tubes. For me it is worthwhile skipping the possible hassle of sourcing new o-rings, gaskets, or worrying over the condition of the part.
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