All I know about the muffler is that my uncle who owns a NAPA store gave it to me for $20, it didn't have any name or any markings on it except which way the flow goes, and it's a 3 in. inlet and outlet. The original exhaust system didn't have a muffler and wouldn't pass inspection with out it so I just threw it on real quick. I wanted to take the muffler off but didn't have the pipe to fill it in with, I live in Maryland so it doesn't have to be inspected again.