For most models, Porsche recommends replacing your spark plugs every four years, or every 36,000 miles (whichever comes first). These are genuine Porsche parts, and by selecting your car you will be ordering the complete set of spark plugs for your specific car.
Boxster & Boxster S Models (all versions)- 2005-08
Cayman & Cayman S Models (all versions)- 2006-08
Carrera & Carrera S Models (all versions) - 2005-08