Here we go with Patch Notes v9.1., and car costs.
Another one with pretty expensive upgrades, if you are in for FU:
Lamborghini Essenza: 1500 GC
McLaren 765 LT: 1485 GC
plus 2 more F1 cars for Invitational: almost 1600 GC
(Details see file below)
Also watch out for ME7’s new video and Paolo’s Facebook site “Trackside” for further details.