Bought some Khumo Escta 712's for the stock wheels and the car pulled to the left as well, rotated the tires and even mounted left side tires on the right side the car still pulled to the left, tired every tire on every corner and still left. Car was aligned at the dealer and it still pulled to the left. Swapped the wheels and tires and the car went straight, dealer blamed the tires. Tire shop blammed the car, I emailed the Khumo warranty rep and he said get the tire shop swap all 4 tires. Tire shop talked to the warranty rep and replaced all 4 tires.... car now goes straight!!!

Try swapping the wheel/tires with a buddy and see if she goes straight, if she does it's probably the tires.

Marty.