A 540 in the pipe is very similar to doing a 360 off of
a normal jump. This is all due to the way you count rotations
in the pipe. Just after leaving the lip of the pipe set the rotation.
Do this by looking over your shoulder in the direction you want
to spin. Keep looking over your shoulder until you see your landing.
At this point stop looking over your shoulder and just look at
the landing. This will stop the rotation.
For extra style cross the skis while spinning. --