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Here's what a "C" muffled with the Donaldson muffler sounds like. I rev through a couple low gears at the end. My 93 year-old-grandmother was riding shotgun when this video was taken. Engine is a "D" rebuild. http://www.youtube.com/watch?v=9eYUKfo2TE8

Kohburn I believe installed an aeroturbine xl (search fu) I muffled my C with the Donaldson, standing next to it at idle you wouldn't think its a C turbo. It only whistles when you rev RPMs and the screaming down the road is all but gone. It's still a loud truck, just doesn't sound like an...