No more crazy leads?

If you remember playing gran turismo you could build a car and be so much faster than the AI and even get 2 or 3 laps ahead. My question is why is it no matter how well you upgrade your car The AI still seems to be right on your butt in forza 5 and it kind of makes me feel like upgrading is pointless? Wasn’t it fun when you could spank the competition from the starting line? Sometimes it’s fun when it’s competitive but it’s also fun to leave them in the dust