What is the True Market Value on aftermarket parts?

Edmunds.com does not provide True Market Value (TMV) pricing for vehicles modified with aftermarket parts. That's because such parts can vary widely in original cost and quality, and there is no reliable information as to how much value they add (if any) to the vehicle when it is resold. Additionally, some modifications may void the vehicle's original warranty.

It is likely that any customizations will actually reduce a vehicle's trade-in value because the dealer will choose to return the vehicle to its original stock condition before offering it for sale again. You may find a better market for a modified vehicle by selling it privately, such as through an online classified service or newspaper, or you may be better off simply returning the vehicle to stock condition and then selling it and the aftermarket parts separately.

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