Since we frequently get questions from new Cobra builders/owners concerning emission testing requirements in VA, the following is the text from VA DMV WEB site.
DMV Virginia Vehicle Services: Emissions Inspections
If your vehicle is garaged in the counties of Arlington, Fairfax, Loudoun, Prince William, or Stafford, or the cities of Alexandria, Fairfax, Falls Church, Manassas or Manassas Park, your vehicle must meet the emissions inspection requirements. Inspections are valid for two years and may be obtained by having your vehicle inspected by a certified emissions inspection station.
If your vehicle is being registered for the first time in Virginia and has a current valid emissions certificate (performed in the last 12 months) from one of the following states, it may be titled and registered without a Virginia emissions inspection:
Arizona, California, Colorado, Connecticut, District of Columbia, Georgia,
Illinois, Indiana, Maryland, Massachusetts, Missouri, New Jersey, New York, Ohio, Oregon, Pennsylvania, Texas, Utah, Washington, Wisconsin
No vehicle subject to an emissions inspection will be registered or reregistered by DMV until it has passed an emissions inspection or has been issued an emissions inspection waiver directly from DEQ for special circumstances.
When you have your vehicle inspected, the emissions station will update your vehicle record at DMV immediately. For emission inspection program fees and information or to find the location of the inspection station nearest to you, please visit the Department of Environmental Quality at (703) 583-3900 or toll free in Virginia at 1-800-275-3844.
Certain motor vehicles are exempted from emissions inspections. This includes:
Any gasoline powered passenger or property carrying vehicle with a model year that is more than 25 model years old before January 1 of the current calendar year and with a manufacturer's designated gross vehicle weight rating of 10,000 pounds or less (i.e. on January 1, 2001, vehicles with a model year of 1976 are exempt from emissions; on January 1, 2002, vehicles with a model year of 1977 are exempt from emissions).
These vehicles also fall within the definition of "Antique Motor Vehicles". However, a vehicle that is twenty-five or more model years old does not have to display antique license plates to be exempt from emissions requirements.