Here's the youtube video in question:
http://www.youtube.com/watch?v=2Ks5LN0xcss
But for me, if I do go to 6s it'll be with DECENT Polyquest / Enerland packs, capable of 150A constant and if I do retain the 20t pinion it'll be on smaller tyres such as HPI Nubz.
They're quoting a "130km/h" top speed and using 3600mah 28C (90A constant) packs