This used to be one of my least favourite glitch tracks. Now it's my favourite.

How to do Lap 1:

1. Turn around at the beginning without drifting until you are a bit past perpendicular with the wall.
2. Right before hitting the wall, boost. This will get you ino the air almost every time.
3. While in the air, don't press any direction on the D-pad. Holding a direction will make you lose your speed.
4. When you respawn after going over the wall you will (hopefully) have a lot of speed. Don't press A to accelerate because of that.
5. Alternate drifting right and tapping A to turn around past the finish line but before hitting the last checkpoint.

The closer to the wall you boost, the more consistent falling out is.

This record could be improved by boosting farther away from the wall (aka G Boosting), but that would mean less attempts succeeding.