The Porsche 928 Custom market includes vehicles that were originally 928s built between 1978 and 1995, and have since undergone significant exterior or mechanical modifications as compared to original factory specs - commonly referred to as restomods or custom cars. This includes body and/or engine conversions, backdated vehicles, and tribute samples. It DOES NOT include vehicles that have undergone restoration, the addition of performance accessories, and/or increased displacement. Vehicles in this market must be evaluated carefully on a case by case basis.