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Old 08-20-2010, 08:32 AM   #2
grafton
Scooby Specialist
 
Member#: 187936
Join Date: Aug 2008
Chapter/Region: MAIC
Location: Fairmont WV
Vehicle:
97 Legacy w/12:1CR
07 WRB STi

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there is some dyno testing on rs25 i believe that shows no noticeable difference between high flow cat and catless in terms of hp & torque

you want to get a ceramic high flow cat to avoid a CEL, and a good exhaust shop shouldn't have any issues stepping up the pipe size
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