The term super saloon is used to describe a high performance saloon car. The term is used predominantly in the UK. Other parts of the world use the term sports sedan. The first ever produced four door car which could be described as a "super saloon" is the Jaguar MK2. With 3.4 liter and 3.8 liter inline 6 cylinder engines in the higher spec models, it was one of the fastest cars around the 1960's.
A super saloon describes a four-door saloon car which has been upgraded with a more sporting or performance basis. The term super saloon could be used to describe a performance four-door saloon car fitted with a V8 engine, but another term, some times used is muscle car, but that normally relates to V8 powered two-door/coupe American cars.
Super saloon is also used to describe a racing car, which is based on a road going family car. New Zealand has a super saloon car racing series