Suggestions wanted for QUIET good flowing mufflers (sleeper build)?

[mopar 3 B]

"OP is building a sleeper. I doubt he cares about sound level INSIDE, he wants it quiet to the spectators/opponents OUTSIDE.
At least, that's the way I think of a sleeper."
Whatever

He had better forget any type of performance. Big block Mopar and quiet isn't happening. You can hide the sound by running it out back. But someone will still be hearing it with any kind of peddle.

 

[mopar 3 B]

What ever happened to the electronic muffler that was supposed to cancel sound?

 

[j-c-c-62]

Consider, normally ICE are considered in the 33% efficiency range for fuel consumed, that also normally means approx 1/3 is basically lost as heat, radiator, radiant, etc. 400 Hp at FW gives off the same amount energy in waste heat and the same third in acoustic energy out the exhaust. As a side note, 1 hp equals 745 watts. A typical quality stereo speaker is 10% efficient, meaning you would have to power the stereo speaker with 7,450 watts to get 1 acoustic hp out of it. Now multiply that by 400hp, and you can see the power levels needed to cancel exhaust levels fully. Think what a TF dragster acoustically emits, and it is nearly mind blowing. There are other ways to address the issue. Current one is to cause a useful tuned fixed resonance inside a muffler/exhaust that is counter to the frequencies the motor is exhausting, and that turns that energy into waste heat, and why mufflers get so hot, when they are achieving their intended goals, conservation of energy and all.