I was just messing around after a race and found that there is a rock just to the right of the finish line that will boost you out into the mountains. Video below. I did get an exotic, but I'm not sure if I had a 3oC on or not.
Maybe this is a shortcut that I didn't know about, but it doesn't look like one.
https://youtu.be/PLffgEWBdsc
-
Yeah a couple have them. One you can hit right after the race, and stay in the air the entire time until the end of the game. You must be at max speed when hitting the jump.