Ascari A10 1.17.3
Koenigsegg CCX (with Top Gear spoiler) 1.17.6
Pagani Zonda F 1.18.4
GTR ?:??.? 
Maserati MC12 1.18.9
Ferrari Enzo 1.19.0
Ariel Atom 1.19.5
Ferrari Scuderia 1.19.7
Lamborghini LP640 1.19.8
Porsche Carerra GT 1.19.8
Koenigsegg CCX 1.20.4
Ascari KZ1 1.20.7
Mercedes McLaren SLR 1.20.9
Ferrari 599GTB 1.21.2
Ford GT 1.21.9
Ferrari 360 CS 1.22.3
Porsche GT3 RS 1.22.3
Corvette Z06 1.22.4
Noble M15 1.22.5
Murcielago 1.23.7
Zonda 1.23.8
For those who can't read white writing.
It's not just the ring that the GTR must be good on.