Firstly, thanks! Great to be able to drive on this track again.
My feedback:
1. There seems to be some sort of clipping glitch at the earlier part of the first tunnel (the right hander);
2. The track limits through the final tunnel corner are quite strict - it's not really possible to cut through a concrete wall, yet even just riding the curb through the corner invalidates a lap;
3. The AI through the final tunnel corner are very slow, impeding their straight line speed onto the following straight.
Get's five stars once these are dealt with, and maybe chuck in some pit boxes too but otherwise, great fun to drive apart from these little niggles.