Chiming in a little late but I used to drive a G35 6MT (The RWD Sport Coup) and it was good for 13.9 - low 14s. I think the AWD will pull 14.1 with no problems. I believe the weight difference is about 150 pounds with awd so you are looking at 3700-3800 pounds. Regardless Gs are quick, pretty much a better looking, beefier 350z.