During its lifetime, the Calibra was much more popular in Europe, and outsold its nearest rival, the Ford Probe, which was considered to be underpowered, and very American for most European drivers. However, in the United Kingdom, it failed to outsell the Rover 200 Coupé, which offered comparable performance, but without 4WD in the top of the range models.
There were two Opel-franchised assembly plants in Ireland in the 1960s. One in Ringsend, Dublin, was operated by Reg Armstrong Motors, which also assembled NSU cars and motorcycles. The second assembly plant was based in Cork and operated by O'Shea's, which also assembled Škoda cars and Zetor tractors.The models assembled were the Kadett and the Rekord. From 1966, the Admiral was imported as a fully built unit and became a popular seller.
But the hot news of the new Kadett B line was the mid-year 1966 introduction of the Rally. Sporting both fog and driving lights, as well as the obligatory racing stripes, the Rally was something altogether new in the small-car market: the first really overt attempt to sell sportiness in the lowest end of the small-car market, at least in the USA. The Ford Cortina GT had been doing it for a few years, but was one class bigger and a fair bit more expensive. The Opel Rally set the template for all the little pocket rockets to come; just like with the big American muscle cars, blatant economy was out, and performance, or at least the impersonation of it, were in.
1938 saw the presentation of the highly successful Kapitän. With a 2.5 L six-cylinder engine, all-steel body, front independent suspension, hydraulic shock absorbers, hot-water heating (with electric blower), and central speedometer. 25,374 Kapitäns left the factory before the intensification of World War II brought automotive manufacturing to a temporary stop in the Autumn of 1940, by order of the government.
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).