Originally Posted by Motordyne

The engine type and cam phasing has a lot to do with all of it.

1. Deep/low pitched exhaust
Generally larger diameter tubing

2. High pitch (not necessarily exclusive to rpm's above 8/9k)
Generally small diameter tubing.
A system design that has sudden expansions or sudden contractions.
Chambered mufflers.

3. Rumble sound even with equal length headers (ex. GT40, SLS)
The "off beat" sound can be the total system design.

4. Exhaust crackle when you let off the gas
Engine tune and exhaust cam phase.
And it helps to have a high flow exhaust.