http://www.youtube.com/watch?v=asA9KwKlT7w
http://www.youtube.com/watch?v=xZzsJ60TvJc
These two vids both show the SC104x4 with a Novak 4.5T 550. If your truck is WAY slower than these, you either have it geared wrong, have too much binding in your drivetrain, or have fried your motor or ESC.