katie.beason

its on a curve...if you follow the road ur supposed to turn on ur left but on the right there is a blue pipe (right after a fart gun )

But how do they look like? And when they appear, do I have to do something special (like, go of track) to get it?

There is one in Gru's lab. It is off to the right and is normally near a fart gun. I found it by looking at areas off the course that have an item "shining" upwards. You can always see those coming up.