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For Grand-Am GT or last year's SGS spec the Cup car is converted by adding a fuel cell and changing the hubs to make them with 5 studs instead of center locks. Those are the main changes. You can also add different shocks and exhaust then the factory carerra cup cars. Some people run the stock exhaust and stock shocks. This year's Grand-Am rules allow changes to the cup car suspension, by allowing them to be changed to RS specs.
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