It is unlikely that a CEL code would appear due just to an aftermarket exhaust. Before you get thigs replaced check if the car has had a re-flash tune? ...ie either ECUTek or Verso?
If so, you would need to take it back to the re-flash workshop who will modify the parameters so it doesn't re-appear...this problem is not uncommon
after re-flash tunes...
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No Subarus currently owned
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