Followed close target
I don't know if people are still looking for how to do this, but it took me forever to figure out, so I thought I'd chime in. At the very end, one you make it around the last turn, you need to slam on the gas and be right behind the second car when hitting the ramps. Before that it never matters how fast you go as the other cars match your speed, but at the end they slow down and you can catch up. After practicing a few times you'll be able to make it without hitting the junk nearby.