What is fair game in professional racing?
 

If your car is more powerful within the rules?

If your car is better braking within the rules?

if your car is better downforce within the rules?

if your car is better mechanical grip within the rules?

Actually, it is your goal to achieve each and every part you possibly can; because at the end of the day, the car that is able to lap the fastest for the most laps behind them is still the race winner, regardless of what the winning car's biggest "advantage" is. right?