New to gran turismo and already completed hooked and fascinated by the game. However, (I'm sure this has most likely been posted several times and sorry for the inconvenience) since progressing through classes C, B, and A, I'm currentlly in S- class and unable to apply tuning changes to my car (Evo X). I have tweaked the engine power as well as the weight but I am unable to even adjust the aerodynamics at all. When racing the car drives identical to how it performed beforehand, therefore I'm not sure if these changes are being applied properly. I have also noticed that other cars on the track have body modifications, such as new spoilers? If anyone could help I'd very much appreciate it. Thanks!