With Autostick and ESP OFF, you should be in the high-high 5's. There is no reason a 2 wheel drive 300c BONE STOCK shouldn't pull a 5.8 to 5.9 pretty consistently.
It's not good for the car, but you can rev to about 2-3000 RPM with your foot on the brake and release the brake and WOT at the same time and you should see some nice numbers.
AWD should be even better if driven correctly despite the additional weight.
The car has been officially tested between 5.9 and 6.1
I think the car is faster than both numbers, I would say 5.8 is not unattainable.
PS,
THE ONLY TOOL ANYONE SHOULD BE USING IN THEIR CARS TO GAIN TRUE 0-60MPH PERFORMANCE IS THE GTECH PRO SS or RR. THIS IS THEE MOST ACCURATE TOOL OUT THERE.
G-TECH/Pro Homepage