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Discussion Starter · #5 ·
umm im not sure if this would help but my 07 cobalt LT has a 2" diameter stock.but i took off the muffler and extended the pipe and have a tip on it with a 4.5" outlet diameter
yeah thats pretty much what I was looking for. From what I understand the inlet diameter of the exhaust tip should match up with the diameter of the tailpipe
 
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