3,000 identical units if the car is going to be in the SCCA affiliated events.

A manufacturer or team can continue to race a car that has ceased production, for a number of years after it has ceased production, but the FIA must have the documentation certifying homologation for the model of the car that is competing.

For the purposes of some series, homologation is allowed if a team can certify that a manufacturer's combined yearly output is for an identical car.

So you might be allowed to compete with a certain model if the manufacturer can produce documentation that certifies that, for example, (1)the combined model year run for 2000 and 2001 is an identical vehicle, and (2)the combined production for those two years totals 3000 or more individual units that have hit dealer showrooms.

A change to homologation rules in 1999 relative to national markets supposedly had something to do with the USDM ITR's return in the 2000 model year. Honda was not fond of the idea, because they actually as a manufacturer lost money on each individual ITR sold, because of the nature of the modifications and the fact that the ITR could not be put together on the normal Japanese Integra assembly line.

Homologation rules get lighter and tougher with the times and the automotive market climate. There's a rumour currently going around rally circles that Mitsubishi is going to have to certify a 25,000 unit run for an upcoming special that they want to have in the WRC.