Use DS on the first sharp right corner down the hill

In junkyard use DS for the sharp right corner. During the drift it helps to press once or twice the digital button to stabalize the car

when road splits you can take both routes, even though left side is a bit faster, but also more difficult

use same line through tunnel like forward

You can either wallbounce or use Tap DS into junkyard, while the latter is faster (or a combination of both)

next left corner use Tap DS as well