[G.R.]

MT's challenge sounds good. Any manufacturers car "as advertised" with his criteria--sort of like you, me, and anyone else would see advertised in any magazine, or website and be tempted to buy--Identical engines and trans, let those that offer IRS have them, other than that no changes--pretty simple.
I 'd only suggest using 2 drivers , each putting every car through the gauntlet, one guy may have an off day, one may be on. And preferably drivers not particularly familiar with the venue or cobra replicas for that matter but experienced in handling high performance cars.

Would be interesting to see the results between the different makes compared with the "advertised" hoopla and owner loyalty that so often "muddy" the waters so to speak