Pressure: Just like drag, you can look at the pressure which goes from white (zero pressure) to yellow (maximum pressure),and if parts turn orange, that means too much pressure and will explode. you have to make it so it won't. like add more wheels, or make a stronger structure.

Intake capacity: It will show from white (no air at all), to cobalt blue (Plenty of air). it will show on engines and intakes, and will be under the "show pressure".

I guess that is all I have, really.