Good question. Even though it is just a couple of inches long I imagine that someone would have experimented with it.
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Lets clear up some confusion:
The current Vandersteen M5HP's come with a few inches of Audioquest Sky which is their top of the line (excluding the brand new Horizon Extreme)silver air-dielectric triple balanced cable. The Sky normally comes with a 72V battery for the DBS (dielectric bias system) but that is not included with the few inch piece used to build the M5HP. Vandersteen does however still provide battery biasing via a wired connection to the Sky from the 9V battery used to bias the caps in the M5HP.
Older M5HP's used Audioquest's previous top of the line interconnect called Amazon, which was also a silver air-dielectric cable, minus any battery biasing.
I cannot imagine that there would be much benefit to replacing this 3 inch world class cable, even with some other 3 inch world class cable, not to mention that it would be rather labor intensive.