Yay, they've left out the Tank Car!
@petaloudas has a tune for RUF CTR "Yellow Bird" 1987 in the recent
Non-Racing Car Drift Trial: Cape Ring. I watched a high placed V8 Vantage replay and then drove this RR layout to 11,554 points.
Took a few tries - had to maintain more angle than I expected and increase speed through the end of the long left. Be patient at the entry; I just kept the launch speed until I reached the shadow of trees. Then full power and a little Scandinavian Flick to initiate drift. Immediately easing off gas and feathering it all the way round, constantly adjusting the steering to keep the drift angle.
Slowing enough for the final right is hard. This setup tends to go straight if you simply lift off gas. So I scrubbed off speed during the left entry corner. Used some handbrake in transition and then gentle throttle. That got it driving forwards through the final right.
If you haven't already decided a car to use here, I recommend this one. RR layout drifting is a novelty in GT6.