> And, someone once said if your car is loud, you're not getting the most 
> performance.

Not sure how true that is, formula 1 cars sound painfully loud yet the 
clever bods there so far have not come up with a way to make them quieter 
and generate more power at the same time...

Also I guess the silencer in your road-car exhaust system sucks a bit of 
power (the engine has to push harder to push the exhaust gasses through it), 
removing it should make your car louder and a bit faster.

Maybe someone could find a way to convert the sound energy from an engine 
into mechanical or electrical energy...

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