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Old 12-03-2002, 03:25 PM   #6
Scooby Guru
Member#: 2272
Join Date: Sep 2000
Chapter/Region: BAIC
Location: Fire Caves
2016 Commodore SS
Heron White


If you were running a full exhaust system I think 3" would be better, but with just the catback you dont really need over 2.5"
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