Wasted an afternoon with the idea of going through all the Gr.3 cars I have. Ran out of time and motivation when I realised how much time I'd actually wasted on some of these. Best time from 3 or 4 laps on full wets, TC 1, BB 0:
Ford GT LM Race Car Spec II: 1:44.6
Skyline Super Silhouette: 1:47.3
AMG '20: 1:43.3
R8 '15: 1:43.8
Z4: 1:43.9
M6 Endurance: 1:44.2
Mustang: 1:43.3
Ford GT LM Spec II Test Car: 1:43.3
GT500 GTR: 1:45.5
'13 GT-R: 1:43.1
BRZ: 1:42.0
911: 1:41.9
'18 GTR: 1:44.0
'19 R8: 1:42.4
458: 1:42.0
For some reason I had the instinct to use the '19 R8, but I found it a lot less predictable than the Subaru, Porsche and Ferrari. Caveats - I'm not any good, I have very little experience of MR cars and less of the rain, and I don't own any Gr.3 Mazdas.