Torque, gearing, power etc. all have a big part in the feel and actual quickness and speed of a car. My 03' 4.4 - sport certainly feels quicker than my friends 06 4.4 sport. We both agree on that, and when we've raced (not really race, just took off quickly from a light) I generally 'beat' him regardless if I'm driving my car or his. I believe the speed differences are nominal at best (I don't know this for sure), but IMO the 03 just 'feels' better to drive.