You may want to contact the State Smog Check Parts Locator. They might be able to help you find an EGR valve for your 1979 Porsche 911.
If they are unable to find you the part, they may be able to issue you a "Limited Parts Exemption". In most cases the needed parts are found. You may contact the State Smog Check Parts locator (and State Referee's Office) by calling 800–622–7733.
