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A used exhaust should be fine as long as there is no dents or dings to the exhaust. I got mine new from Amazon for about 600 and change with free two-day shipping. You can get it in the 400s used or better.
I actually purchased the exact same used exhaust from a local member here. Can't complain, seems to be running all good besides the usual wear and tear blemishes on the exterior. But nothing that wax and good old elbow grease can't fix.