ricque, you debate oddly. there's no mention of equal length in your side of the debate that you cut and pasted. so your argument doesn't support your contention.
from wiki, which isn't the authority on tuned headers, but it's correct:
"Headers are generally circular steel tubing with bends and folds calculated to make the paths from each cylinder's exhaust port to the common outlet all equal length (and they're not talking about tuned headers yet) , and joined at narrow angles to encourage pressure waves to flow through the outlet, and not back towards other cylinders. In a set of tuned headers the pipe lengths are carefully calculated to enhance exhaust flow in a particular engine revolutions per minute range. (and it doesn't say equal length is part of the deal) "
(my words now) in fact, the header tube VOLUME is more important than length alone, which is one reason why you see stepped tubing in some applications. it's also why tough-to-package engines may use a short fat primary or a long skinny primary: they're nearly identical in volume and it all matters what packages best. also, notice that many bike's intake velocity stacks are unequal length. that too is "tuning" in the EXACT same sense as tuning headers.