At market launch in 1990, all-wheel drive system was optionally available in addition to the standard front-wheel drive for both 2.0-liter gasoline engines. In March 1992 Opel made waves when the Calibra Turbo entered dealerships at a price of 49,800 marks. All-wheel drive, a six-speed gearbox, sports seats and 16-inch light alloy wheels came as standard. However, those affected aerodynamics – 16V, V6, 4x4 and turbo models had a worse Cd of 0.29, due to changes in a cooling system, underbody, use of spoked wheels and glass detail.
The GSi's engine mapping had been carried out by Opel tuning specialists Irmscher. A model with the 82 PS (60 kW) 1.4 L multi point fuel injected engine, which was otherwise mechanically identical to the GSi, also became available as the Nova SRi in the United Kingdom. In January 1988, a turbocharged version of the Isuzu diesel engine was introduced, with power increased to 67 PS (49 kW).