I just ran CSG Spec C2 for the first time (only at the front, with Winmax W5 rears) at Palmer this past Sunday. I ran them with Conti ECS street tires and with Hoosier A7s and honestly they were great at the track with either, which in retrospect is kinda surprising given the radical difference in tire grip (A7 5 seconds faster). I found the pads to be very linear and predictable throughout ~15-20 minute sessions. Plenty of bite but not too initially-grabby, which makes me feel more comfortable about the possibility of disconnecting ABS to save a classification point and drop another 42 lb. for Watkins Glen next month... Won my time trial class at Palmer, COMSCC T60 (9 competitors including a 981 Cayman S) with a 1:48.16
https://www.comscc.org/events/result...?id=2020-08-09
They're also fine on the street, they work when cold, not too noisy and not too dusty either. Pretty remarkable!