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Old 08-20-2010, 06:04 PM   #7
RaceFaceXC
NASIOC Supporter
 
Member#: 165749
Join Date: Dec 2007
Chapter/Region: South East
Location: stupid Florida
Vehicle:
2007 No YELLING
on the bus!

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double what Formula91 said, especially with stock exhaust manifold. I would only ever change to a HFC if fitment required it or engine work required it. A catback will possibly be louder with a HFC, likely more raspy and buzzy. track pipe will intensify these effects and guarantee a CEL.
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