You should probably read that the Sidewinder can only handle the 5700 on 2s, not 3s. You can run the 4600 on 3s, and that will still be rediculously fast.
My vehicles (that work):
Custom experimental Losi 810/TEN SCTE - The fastest 1/8 scale buggy on the track - 5.2lb rtr - readily convertable to a ROAR legal 1/10 scale 4x4 SCT.
Custom Losi 8ight - lowest CG of any 1/8 buggy
Losi 22 Mid Motor