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Anonymous
>>191558 true in theory, but in realistic applications combustion is pretty damn loud regardless (everything from a lawn mower to the family sedan to a supercar is noisy as hell without a muffler). The noise an engine makes is pretty much only affected by the amount of dampening designed into the exhaust system, and also by the turbines in turbocharged engines. You lose power by quietening the exhaust, hence most fast cars are loud. Like said, in theory you can extract more power like you say by doing certain things that would result in quieter exhaust, however with current designs you can get more power (albeit less efficiently) by dumping (very loudly) after peak power output and just combusting again. It's a trade off between raw power output and efficiency, these days efficiency rarely wins.
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