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
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interesting, through I doubt it's for anything, but here's another conspiracy for you; The dawning record book sparrow is 150 speed instead of 160. Maybe we can upgrade with one of xurs engines? Maybe we can upgrade all our sparrows with them?