MSS Discovery Racing was a team that fielded bikes in the Superbike Racing Series in the UK. SBR uses highly modified production motorcycles. Manufacturers love this racing series for the fact that it does use a production motorcycles, so that the consumer can relate to the bikes and if wanted too, buy the bike the see racing on the track.
There are a variety of different Superbike Series out there, Superbike World Championship, National Superbike Series, British Superbike Championship, etc… They all are based on the same idea of going around a road course with a highly modified stock bike for the best times.
In general the motorcycles must maintain the same profile as their on the road brethern. Normally thought the teams are able to modify almost everything about the bike in someway, such as the suspension, brakes, swing arms and even the size of the wheels and tires used, a good example is the Ducati 999.