Could those who are interested give this a go in single player:
FOX: 25% Intake restriction, 25kg weight penalty.
I've experimented this morning, I found that an intake restriction only lowered speeds on the straight and resulted in shorter braking zones and a car that was equally twitchy as normal and no easier to control, the only difference was a slightly reduced rate of mommentum - but my experience tells me the problems are the difficult corners, not just the reaction time that Fox speeds require.
So I loathingly added 25kg weight penalty to the mix, I wasnt keen to add mass to a car that might not brake into T1, but actually the effect worked quite well as it reduced cornering speeds too and made the car, in my estimation, much easier to drive.
Others thoughts on this?