Technical exhaust question

Pat /
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Ok, exhaust, expansion chamber...

What is the expansion chamber more sensitive to: displacement, or rpm of the engine? When is a chamber too big or small? Is a lower powerband on a smaller engine = a higher powerband on on a bigger engine with the same pipe (or something like that)? Are some exhaust pipes tuned to specific bikes/kits/carbs?

...just thought I'd throw that out there for ya

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