OK, here is WHY the correct answer is 'Yellowbird, BTR, Stratos' with honorable mention for the Ford GT cars and cobra...
Some cars, it doesn't actually help to put on racing softs. The Yellowbird's weight balance is so off, and the Stratos wheelbase is so short, that if you put good tires on, all that happens is the car's misbehavior gets more quick and violent. It's the same instability, but more and more aggressive. This assumes you are pushing the car to its limit (sort of the point, really?)
With the Ford GTs, it's sort of more that you can always put the car out of control at any moment, if you don't know how fast the corner is. It's not inherently evil, it just does nothing whatsoever to stop you getting yourself in trouble.
With the Stratos, due to the short wheelbase, at speed any little mistake in correction can flip the car out pretty much instantly. I suspect this is why people are including the Caterham (which I don't think is in the same class, unless maybe you mod it). The Cobra's in the same class- less twitchy than a Stratos but with more uncontrollable power. These are semi-evil, they don't win for 'most totally evil'.
With the Yellowbird, due to the extremely Porsched-out weight distribution, it's specifically speed that kills you- past a certain point of slip the car wants to accelerate its spin violently. The more speed you add, the smaller a correction you can make before hitting that point. At insane speeds, you're basically clinging in terror to the wheel, holding it perfectly still, wondering how the hell you're going to decelerate without slamming into a wall backwards while spinning at about 3000 rpm

and it's so much fun to accelerate, that wonderful noise and the way the world whooshes by.
At any given moment, you can get in horrible trouble within about one and a half seconds using the accelerator. Also, the car is only stable while accelerating. Violently. So you're only safe WHILE you're getting in horrible trouble within a few seconds.
Best car ever
