That's the thing though, believe it or not, the majority of these cars need no tuning at all. Really the only reason you would need to tune a car is to eliminate it's week points.
Example: The FC rides very high and has alot of body roll. This isn't ideal for drifting so you'll want to correct that buy modifying the suspension. Then you drive it again and see how it does. The car will now perform very well in near stock form.