Which car are people using for the Unmodified Pro-am races?

I’ve been using the Evo X ‘07 and have also tried the 370Z ‘09 but on some of the tracks I’m still a minimum of 2 seconds off the qualifying time, even though I’m putting in perfect laps and can’t see any points that can be improved on. I have all the traction, ABS and steering assist settings off completely.

Is there a better B or C car to use?