Depends on the race. In the Impreza time trial, I was getting about 25 fps at 1024x768 with 2xAA and everything set to high quality. But with the motion blur turned on, it's actually feels smoother than that.
It's very demanding, but looks incredible.
Core i7 5820K hexa-core @ 4.4 GHz | 16 GBs 2400 MHz DDR4 | Dual MSI GTX 970s | Dual 128 GB SSDs