Quite Quite out the exhaust pipe. Did I say Quite

Looked at a few different threads on the A body forum. They all seem to talk about sound and rumble. I'm trying to get so quite, that if you were listening to the exhaust pipe and a nat flew by the exhaust and farted you'd here the fart. I'm seeking QUITE from my stock automatic slant 6. Quite like it's not even running. If that's possible