Hi Vex!
Haven't heard of anyone doing this yet on the 2008's, but would be curious to know how it works out. Runner length is always a compromise to balance intake needs at low revs, mid revs, and max revs. Some Yamaha sportbikes now have electronically controlled the runner length by opening them up to shorter length once the bike reaches certain revs. Helps high end power without losing torque down low. So I'd imagine the theory's sound, if you want to move the power band a bit lower in the rev range.
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