Adblue is a system which puts harmful NOx into your diesel fuel exhausts into harmless nitrogen and water vapor, thereby significantly reducing emissions of nitrogen oxides (NOx) that are a major source of air pollution and cause smog. Also Adblue can be switched of in the engine management system.
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.
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.
The DPF, also known as Diesel Particulate Filter, is a filter which filters soot particles and particle matter. It's developed to make diesel vehicles less harmful for the environment. A DPF is an expensive part and can generate diagnostic trouble codes and cost a lot of extra fuel.√Ç¬†A DPF can be removed or switched of in the engine management system.
The EGR (Exhaust Gas Recirculation valve) is a valve which recirculates the exhaust gas back to the engine cylinders to reduce the NOx emissions. The EGR valve can cause pollution in the engine block and will therefore sometimes be closed and shut down software-wise. Turning off the EGR valve is prohibited in the Netherlands.