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Old 05-30-2009, 12:49 AM   #7
Scooby Specialist
Member#: 151079
Join Date: Jun 2007
Chapter/Region: MAIC
Location: College Park, MD
2005 2.5RS RBP
too many friction losses


Nah, the headers are the most "restrictive" thing in the exhaust. The cat only becomes a restriction if you have cams or something similar done to your engine.
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chazly413 is offline   Reply With Quote