The Porsche 911 Custom (997.1) market includes early 997.1-generation vehicles—produced from 2005 to 2008—that have undergone significant visual or mechanical modifications beyond factory specification, typically categorized as restomods or full custom builds. These cars often feature body conversions, engine swaps, or substantial drivetrain alterations that depart from original Porsche configurations. This market excludes vehicles with basic restorations or those fitted only with aftermarket performance accessories, focusing instead on builds with transformative changes to appearance or mechanical identity.