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The differences between a rollbar and a rollcage are the number of connections or points between the structure and the vehicle and the ability of the bar or 'cage to protect you from additional crash angles. Generally, the 'cage will have 8 to 10 or more points and the bar can have as few as 5. The 'cage will usually have a forward hoop that runs from the main hoop to two forward down bars. 'Cages might also have sill bars and dash bars and will need to be SFI certified and stickered every three years. For most classes, if your car runs faster than 9.99, you will need a 'cage. This NHRA illustration represents a typical rollbar designed for a car that has a stock firewall and floor and runs between 10.00 and 10.99. This is the bar that is going into the CC/Rambler.