If you want to pull some incredable rotations do the following: (you'll need gray the alien)

(1) Drop into the pipe holding left or right out of the gate until you get to the part of the ramp where the incline begins. You will get a little ammount of air, you will go up and come straight down. (you should be facing down the pipe when you let go of left or right)

(2) Right when you land hold X and LEFT or RIGHT

(3) Hold the direction and X as long as possible, you'll want to do it to take as long as possible. (you're turns will pretty much be straight back and forth through the pipe)

(4) When you want to, let go of X and watch (keep holding over)