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Basically like any code of racing, it is the rules and limitations governing each code. A vehicle competing in a particular class will be built to comply with the rules of that code. Try some of these links. http://www.worldhistory.com/wiki/G/Group-B.htm http://www.worldhistory.com/wiki/G/Group-A.htm http://en.wikipedia.org/wiki/Group_B http://en.wikipedia.org/wiki/Group_A If you're looking for specifics, then the single best place to look would be at the FIA website. They are the group who administer all of this and set the rules for each class. The page for all their regulations for ALL their classes of racing is at: http://www.fia.com/sport/Regulations/index.html Happy hunting.
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