VMAX & CUT OFF   

✅️Vmax Off refers to the process of removing or increasing the factory-set speed limit (Vmax) imposed on a vehicle by the manufacturer. This modification, implemented via the ECU (Engine Control Unit), allows your car to reach its true maximum speed, unrestrained by software limitations 

✅️Cutoff is actually when the engine intake valve closes and for a few moments the air or fuel enters the piston. Nowadays, the Cut Off is special for engine drivers controlled by ECU or the same computer