Exceptions to the nomenclature of ending names with an "a" include the under-licence built Monterey, the Speedster (also known as the Vauxhall VX220 in Great Britain), GT (which was not sold at all as a Vauxhall, despite the VX Lightning concept), the Signum, Karl, and the Adam. The Adam was initially supposed to be called, "Junior" as was its developmental codename and because the name 'Adam' had no history/importance to the Vauxhall marque.
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).