Meanwhile I'll actually compare it to doing a lap in the Yellowbird and the Cobra!
EDIT: ok, yes, you're right, if the F40 is a handful, the RUF Yellowbird, at least on 100% BOOOOOSCHT, is completely off the chain. Would need to drive with wheel and pedals, because I rapidly overheated the tyres sliding the rear out on just about every single corner. Highly doubt I'll be able to beat the F40 time. Video to follow.
The only advantage of using an RR car is that they're easier to control in power oversteer. However they're also twice as hard to control under braking, as you'll well see in the coming video!
Time in this car is a 2:43.002
I'm so salty right now, I uploaded it in HD format (3.5gb of upload later), and it still won't let me adjust quality higher than 480pp. Might as well zip the damn thing, what the hell. Anyway, much much sideways. Unfortunately this was my best lap after about 50 tries and I tapped a barrier on the final corner, but it was 100% aggression to the point of badly overheating tyres in the last sector. The vintage tyres can not handle the full 1.4 bar.
EDIT 2: tried it in the Cobra. The Cobra is limited by top speed, due to a rather un-aerodynamic state, but being FR it's actually a bit easier to control, particularly as I don't have to work so hard to catch the oversteer. As a result it actually comes out much faster from the slow and medium speed corners, so I think I got somewhere in the 2:41s.