Engine modifications: Changes to the original engine, such as increasing displacement or adding a turbocharger, can diminish the car's authenticity and value.
Suspension modifications: Lowering or altering the suspension can affect the car's handling and may not align with the original design intent.
Body modifications: Significant body changes, such as widebody kits or custom bodywork, can detract from the car's original lines and appeal to collectors.
Non-original paint colors: Painting the car a color that differs from the original factory options reduces its originality and value.
Custom interiors: Extensive modifications to the interior, including reupholstering with non-original materials or adding aftermarket gauges, can detract from the car's original charm.
Non-original wheels and tires: Changing the original wheels and tires to aftermarket options may not match the car's design and can decrease its value.
Aftermarket accessories: Adding modern accessories or gadgets that were not available during the car's original production era can negatively impact its authenticity.
Poorly executed restoration: A poorly executed restoration, such as using incorrect parts, low-quality materials, or deviating from the original specifications, can significantly reduce the car's value.
It's essential for collectors to maintain the original condition and authenticity of their classic vehicles to preserve their value and appeal to serious enthusiasts.