dumbest of all questions

[beaky]

Besides, airplane engines sound great, so what's the matter?

Exactly... some call it noise, I call it music. 

[hhomebrewer]

Besides, airplane engines sound great, so what's the matter?

Exactly... some call it noise, I call it music.

[Tyler012]

Because the'yre about concentrating heat, not muffling..

And they're a real good source of carbon monoxide when you get a hole and the shroud brings it in with cabin heat

[TacitBlue]

Here's a typical installation on a Cherokee. Two cylinders exhaust into one muffler, the other two exhaust into the other. They are bright and shiny because I had just replaced the old leaking ones with these brand new ones right before I took the pic.

[OVERLORD_CHRIS]

Slight update, yesterday an AH-64D was doing loops around field for what every reason, and 1000ft, that thing is pretty quiet, you could only hear it when it was really low and flaring.