Having built (and tracked) a knock-off Atom, "high-speed" is relative. Even with bonkers power and light weight, the thing is so dirty aerodynamically that you have to really work to get over 140mph. Of course, I have much less power (20obhp), but fifth gear acceleration is as poor as 1st gear's is brutal. » 5/30/14 9:22am 5/30/14 9:22am