Thread: Flowmaster American Thunder Dual Mode Axle-back (NPP) for 2016+ Camaro SS & ZL1
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Old 04-08-2019, 09:39 AM   #152
6spdhyperblue


 
Drives: 2SS 1LE
Join Date: Aug 2013
Location: US
Posts: 3,786
Does it hiss at the low cfm at cruise or just when pushing a bunch of air through them?
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