Ran Thunderhill West CW (backwards) without the bypass! In the first few minutes of the video I talk through the line that worked the best for my F80 M3. 

0'00 - 2'45 - slower pace, babbling about the line / straight lines
2'45 - 6'20 - faster pace, less babbling
6'20 - 8'50 - faster pace, almost no babbling

This direction is about 1 second faster than CCW. Lap times here are in the 1'25 - 1'26, I was able to run a low 1'25 this day. 

Car setup:
- stock power
- 275 square Michelin MP4S - ~34 psi hot
- TC Kline suspension
- Stock calipers - Ferodo DS1.11 pads front, DS2500 pads rear