Engines Podcast Engines of Our Ingenuity 2966: MufflersEpisode: 2966 Mufflers, Noisy Motorcycles, and Acoustics. Today, we pipe down. Dr. Andy Boyd | Posted on September 12, 2019, 12:01 AM Episode: 2966 Mufflers, Noisy Motorcycles, and Acoustics. Today, we pipe down. / To embed this piece of audio in your site, please use this code: <iframe src="https://embed.hpm.io/345264/345263" style="height: 115px; width: 100%;"></iframe> X This article is part of the Engines of Our Ingenuity podcast Share