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Originally Posted by xoxoxoBruce
I agree with most of your post but that point is not necessarily true. ... Maximum performance requires low (but some) backpressure and preventing the exhaust pulses from the individual cylinders from interfering with each other.
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If the exhaust pulses interfere with each other, then you have MORE noise and LESS engine horsepower. Again, more noise means less performance.
For those who want to throw a grenade into the mix - yes an Indy car has better performance and makes more noise. But which Indy cars have higher performance? The ones that make less noise. All else being equivalent - less noise means a better car, more horsepower, less pollution, longer vehicle life, etc. But you cannot tell that to the fools who just know more noise means a 'cool' car. So just laugh at them. They don't even remember principles taught in junior high school science.