Summit Point Main in August '18 in my 535 ran 1:37.5
Summit Point Main in October with PCA ran 1:29.5 in my stock M2 with 1200 miles on it. This is video of one of the sessions:
PS: went for a few laps with a BMW instructor Joe G (isjoey) who really showed my what the car can do with just better brake fluid, pads and camber plates. I understand he routinely runs in the 22s, so that's my goal for next year with similar setup.