Quote:
It's like walking across Iowa...
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Boy is that the truth.
The unequal length of the H-pipe is recovered with one short and one long flowtube. The mufflers on every mustang I've seen have been side-by-side (unless it was hacked up at a muffler shop).
The drone has to do with the length of pipe...different lengths give you different eigenfrequencies, which can be amplified or diminished by mufflers (think Flowmaster or Super Turbo). The heimholtz chambers can change the frequency where the thing drones...or cancel out certain frequencies.