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According to HPI valuation experts, vehicle modifications can limit potential buyers and negatively affect resale value. Non-manufacturer modifications can also void warranties and impact insurance coverage, especially if not fully disclosed.

Most buyers prefer unmodified cars, and cosmetic changes like poor paint jobs or body kits can significantly reduce a vehicle’s appeal. Engine modifications, such as ECU remaps or larger turbochargers, can raise reliability concerns and maintenance costs, while unauthorized aftermarket parts may lower the vehicle’s value.

Jeremy Yea, senior valuations editor at Cap HPI, notes that modifications are often tailored to the original owner’s taste, which typically decreases resale value. The impact on value depends on the quality of the work, the ability to reverse changes, and their legality; unapproved modifications can lead to unroadworthy vehicles.

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To maintain value when modifying a car, retain original parts, focus on performance enhancements, use reputable professionals for installation, and consider the long-term effects on insurance. Yea concludes that although some well-executed modifications might slightly increase value for specific buyers, most tend to reduce resale value and limit buyer interest.

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