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Old 02-16-2012, 12:25 AM   #1 (permalink)
RoshDawg
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Default Understanding exhaust notes

Just curious about what causes different type of exhaust notes. For example, rumble sounding exhausts are normally caused by unequal length headers (ex STi), but what about:

1. Deep/low pitched exhaust
2. High pitch (not necessarily exclusive to rpm's above 8/9k)
3. Rumble sound even with equal length headers (ex. GT40, SLS)
4. Exhaust crackle when you let off the gas

I'm simply trying to learn about the acoustics of exhausts so any relevant info is appretiated. Other types of sounds and their explanations are very welcome.
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