I went and signed up for the forum that the video was originally posted in. )
Fuel Sluts
98 snake eater owns the goped, and I'm not sure who was riding it in the video.
That spray is purging air from the nitrous oxide lines, making the nitrous pressurized and ready for injection.
This goped is serious shit and many people from the board have ridden it and wiped out.
The firebird might be laying off the throttle a bit but in this short of a race ( probably less than an 1/8 mile ). The goped is rumored to top out at 80-90 ( they don't have speedometers, duh) and one guy claims triple digits. As for engine, it hasn't been dynoed yet, but it can turn a car dyno, which makes it pretty powerful.
Even if the pass was staged, the goped clearly keeps up with the transam in the race, and noone one the board says that the thing is slow.