One of the possibility could be a bad Acceleration pedal sensor which can give a wrong input to ECU. (mechanics.stackexchange.com)
With the VC - Turbo, the driver balances the engine character through acceleration pedal operation alone. (greencarcongress.com)
The Senner Tuning Opel Astra is also equipped with a new exhaust system featuring 140x90 mm stainless steel end pipes, a power converter for the electric acceleration pedal and red painted brake callipers. (carsession.com)