So, before this catches dust again:
Audi V8 had its front suspension reworked to get the weird judder out of the car. I think it was way too low caster on the front axle. FFB has been adjusted accordingly.
Mustang GT got new scratch made front suspension thanks to workshop diagrams
@Stereo dug up. It should no longer collapse. Feel is nice, raw power but a car you really need to manhandle around a track.
No big changes to the Opel.
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All three had numerous tweaks done to them to slow them down especially in the hands of the AI. Just like in real life the Audi V8 will still win most races, but the field is much closer now. Tweaking was done to aero, brakes (and brake heating), gearboxes and the AI settings if the former wasn't enough.
I didn't touch the new E30 Tommy released... as I don't see the point, the Kunos E30 works just fine, especially with
@Kyuubeey's physics replacement, and whatever Tommy cooked up in terms of suspension for his car is just weird.