This is the 'Super Saloon' any engine, any vehicle Class. The engine(s) must be of a minimum 1421cc capacity and have no maximum with multi valve engines being allowed in this Class.
Class Seven cars consist of a multitude of engine types with 1.8 / 2.0 SOHC & DOHC / V6 / V8 engines mainly mid-mounted or twin motorbike engines and gearbox unit chains or gear driven onto a common mounted shaft.
Modifications allowed: unlimited modifications that are allowed, this is the most powerful Saloon Class in the sport. The engine / gearbox / transaxle / axle need not be original or fitted in its original position.
This Class is widely regarded as the most spectacular of the Saloon Classes, for both driver and spectator for its action packed, sideways racing.
Cars you can use: Body shells that can be used include: Peugeots / Novas / Fiestas / Clios or even old / new style Minis with the engine(s) and gearbox not necessarily being of the type originally fitted or even in the position the original manufacturer intended or imagined!
Class 7 rule book on the official NASA website