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#39: 01-29-2013, 08:55 PM
 
 Kiyo1990
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Title: Contributor
Location: Aurora, Illinois
Car: 1997 Subaru Legacy GT Automatic
Posts: 469
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I found that I need a front cat...p0420 bank 1 cat efficency. Will be doing upstream o2, headers, and cat at same time.I am pondering doing the rear cat and a muffler at the same time.