Our apprentice at the shop rescued a brand new Stebro muffler from the metal scrap pile when our parts department was doing some spring cleaning. So after cutting, grinding and welding I installed it on my 78 280 stock engine with 2" exhaust. the vid is after 1 hour of driving. There is no drone, and is weirdly quiet when driving under full throttle from the interior. So I made a vid of it revving, and was surprised at the exhaust note which was a nice deep exterior sound.

 

Wow, that's a great sound. Quiet inside? That is even better. Good find sir.

 

Thanks, it will be interesting to hear it after a few thousand miles on it. But so far for a scrap part find, I'm very pleased.