The other reason for the B’s success had to do with GM: once again, after having failed to slow down the VW’s ascent with their 1960-1961 compacts, they were forced to take the small car market seriously. That led eventually to the Vega in 1971, but in the shorter term, it meant marketing the Opel as something other than with which to remodel the garage. Now the Kadett family, which included a new fastback coupe, sedans and wagon, was seen in front of the typical American garage: two Opels for the price of one Buick.
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).