Came across this on youtube. I'm not sure what modifications they have on the car, but he gets pretty deep into 6th on the straight (1.5km).
https://www.youtube.com/watch?v=WkPAvlML1p4
That course is a tricky one, there are many corners with few cues and a narrow racing line. The lap is obviously compromised by lap traffic (it looks like an open track day from the variety of cars).
enjoy!