I was faster at 131 but not by much. I think the prep was easily equivalent at my level and plenty of cars beat their 131 times today as well.
A lot of the faster cars starting off at Milan were loose or spinning. May have been cooler when they started there then 131 but neither had sun on the track at the start. The kid that does the prep at 131 is hired all over the country to do prep at different races. From what I saw 131 was hooking from the start where the rest were not as good to start
Nice thing for most of us is we don't need the prep the real fast cars do. I have run high 10s on 20" nittos
Good luck on your last day