Thread: hi flow cat question
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Old Feb 23, 2003 | 02:11 PM
  #4  
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kabob
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A 2.5" cat only bolts directly onto a header with a 2.5" collector (JDM-spec header) and a 2.5" catback. The ITR uses 2" piping all around but I have no clue what a GSR uses.
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