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Old 02-03-2001, 12:49 AM   #9
stimpy
Homicidal Maniac
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Member#: 1612
Join Date: Jun 2000
Location: Austin, TX
Vehicle:
2008 STI

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Most will argue that a 2.25" catback will have minimal low-end loss. A 2.5" catback will allow your engine to breath better up top, but it will come at a loss of the low-end.
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