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I had tried something similiar to this with a different approach at the time. '04 was the year... and 4 strokes really became popular in the motocross community.
Because of the rear shock, the airbox snorkel is biased to the left. The 4v head has a common intake port that splits in the middle. Because of this bias, the left port is shorter than the right port by a fairly large margin. To compensate for this I used an oversized valve on the left shorter port to try and equalize flow. This is pretty much exactly the opposite of what you're accomplishing here David.
My conclusion on the dyno, it ran exactly the same... no change.
Just thought I'd share my findings on the opposite of what this article is showing.
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