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Old 05-30-2009, 12:49 AM   #7
chazly413
Scooby Specialist
 
Member#: 151079
Join Date: Jun 2007
Chapter/Region: MAIC
Location: College Park, MD
Vehicle:
2005 2.5RS RBP
motec system exhaust-RIP

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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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