IDRC - Import Drag Racing Circuit
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IDRC 2001 Rulebook

At every event, we run 3 bracket classes, which is open to all imports and FWD 4-cyl domestics (RWD 4-cyl, see Rules For All Classes no. 13). All racers may try to qualify for one of the heads-up classes as long as their cars adhere to the rules for that class. If they do not qualify, they may continue to race in the bracket classes. Those who do qualify and get eliminated may not continue to participate in the bracket classes.