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it controls the the exhaust valves. you can leave it stock or disable it so the baffels never close.
car is louder at high rpm if the baffels don't come into play.
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shopping for 2017+1le or zl1
2009 CTS-V -sold
2015 Hellcat-sold
2013 ZL1 -sold
2007 Z06- sold
2014 Chrysler 300
2011 Duramax 8" lift, deleted tuned
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