Muffler ????

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Has anyone successfully installed an exhaust system with muffler. I have about 17 hours on my RV6A and have gotten my first complaint about the noise. I also thought it might quite the cockpit down a little. Pic would be great. ( 0-320 H2AD )

 

[osxuser]

Who is doing the complaining? It would seem an RV is quieter than say, and Cessna 210...