Thread: ZL1 exhaust pipe diameter?
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Old 11-06-2011, 08:52 AM   #4
cyrusthevirus
 
Drives: 2009 chevy cobalt ss, 1989 Iroc-z
Join Date: Oct 2011
Location: pa
Posts: 75
but u def need to get some high flow cats those factory ones r way to restricted
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