Im not sure if russ stocks them, but i know all of the race spec aprilias use Titanium/Vanadium alloy powerbands (2 per cylinder). They dont have the most power increase (around 90% of the rainbow ones), however they do increase the torque no end, you can easily to a small elephant, and you can even wheelie in 6th. As stated above, elbow grease is mandatory, as is the use of 156RON petrol at all times, otherwise the powerband will not be fully lubricated, causing it to snap and lock up the front wheel, meaning you will go head over heels.