If the alterations are appealing and professionally installed, modifying a car can raise its worth. Modifications can increase car value, but it depends on the type of modifications and the preferences of potential buyers. Engine upgrades and aesthetic modifications like body kits can increase value for the right buyer. Using OEM parts for engine repairs or improvements helps maintain or increase car value. However, aftermarket parts can decrease car value if they don’t meet the same standards as OEM parts. A new engine or performance upgrades using OEM parts can increase car value if installed correctly. It’s essential to consider the potential impact on value when deciding on modifications.