Thread: NPP Muffler Mod
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Old 01-29-2017, 01:16 AM   #13
RupertPupkin

 
Drives: 2014 Camaro SS 1Le
Join Date: Feb 2016
Location: IL
Posts: 1,706
Yes. Having the valve open will jave a straight through sound... i keep it open. With the perforated pipe sealed, itll be more of a straight pipe with the option to quiet it down.
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