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Im looking at the flowmaster 40 series online and it looks like there a bunch of different kinds of 40 series. anyone know which would probably be the best one to choose? I have a silverado z71
well i was jsut gonna buy something off ebay and put it in myself becuase my friend is a welder and he has a pipe bender... and i was looking on flowmaster.com and i really liked the super 44 so i might go with that