Vehicles with a period-correct engine and body, with multiple removable modifications, or a few significant modifications such as increased displacement, added performance equipment (turbo, supercharger, headers), transmission swaps, bumpers, or body wraps. Modified vehicles can generally be returned to original factory specifications.

Highly modified and/or Restored vehicles with uprated, non-period correct engine swaps, or engines from outside the original manufacturer, and/or vehicles with significant body customizations or conversions. Generally, Custom vehicles cannot be easily returned to their original factory specifications.