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stock is 2.5 look at some of the header manufactures the connection pipe to stock catback size is 2.5.
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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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