The shock springs are from a Havok that I happened accross that I though would take a little more punishment off of jumps.
Here it the Video just using 7.2V Max Amps 2S Lipo Pack. On 3S it's completely uncontrollable and yes the performance will easily match a Rustler VXL or the stock Nitro performance. - Enjoy.
http://www.youtube.com/watch?v=6oQfTAaM5u4