DTC's, also known as Diagnostic Trouble Codes, are electronic messages in cases of problems with the engine or transmission. They can be switched of when the causes are found and solved.
It is possible to remove the Vmax, which basically is a speed limiter. Nowadays a lot of cars have a speed limiter and that means that the full potential of the car isn't reached.
Flaps are small valves which vary the length / volume in the intake manifold to create a more beautiful coupling and more efficiency. The flaps can be deleted and can be switched of in the engine management system. Sometimes the flaps break down and when that happens, there is a great change of damaging the engine.
A Start & Stop system is a system that is shutting of the engine when the engine runs stationary. The system can be turned off in a lot of cars via a button but sometimes it isn't possible. For those cars, the Start & Stop system can be switched off in the engine management system.
POP & BANG CRACKLE MAP
Pop and bang is the principle of antilag but then in coast down condition.