Get to the end of the track. You should see the afterburner sitting on the high ledge immediately in front of you.
As of yet, only a single confirmed case of somebody successfully jumping to the higher ramp has been confirmed and they flew upwards, unfortunately finding nothing but the ceiling above them. There may still be something to be found by flying to the left, but there is also the possibility that there is nothing hidden at all and that the afterburner is merely meant to allow players to get a large number of flips in the skill game.
This section is reserved for Confirmation/comments about this investigation. Investigations will remain open until advised by Redlynx that the final solution for each secret is found.