Truth is there are some real benefits to CF, namely it doesnt rust, looks cool and can provide weight benefits if orchestrated properly.
Something like a CF hood can lower the center of gravity, this is good....but.....it also reduces forward weight, and this is bad. Basically you are looking to get weight forward and as low as possible. The low weight will help the car from rolling in a spin and forward weight keeps the car straight.
If one car can go 200 mph and weighs 1000 pounds if you add 2000 pounds more weight (3K total) you will only loose a few mph. The loss is from tire deformation and rolling resistance on the wheel bearings.
This is another story when you start talking about 300+mph vehicles where rolling resistance can start to become a real drag.
Basically dont worry about weight reduction, it will waste you money and may make your car unstable at high speeds. Do concern yourself with proper COG/COP relationships.
-and....
We were all nubes at one point....
~JH