I did this race again for the first time in a long time since it's come up in the weeklies and it wasn't much of a challenge at all. I remember it being more difficult in the past.
I used the 992 Turbo detuned to 543hp on SH tires. No mods except a duckbill spoiler and wheels. One stop for fuel, no tire swap. Won by 30 seconds.
There are a TON of cars that do well here. I've done it in the AMG GTS, LFA, 911 Turbo, GT3RS, GT3, E46 M3, R8, FL5 CTR and a bunch of others. If you take something that's already relatively quick, make sure it has a decent top speed via transmission final drive adjustment, and tune the power on SH/SM tires to right at 600PP, you should be good to go.