Sorry for the delayed response.
The cars purchased prior to marriage are at least partially your separate property. Where earning during marriage are used to pay on a separate property debt, the courts have applied a similar method for determining that the marital estate has obtained at least a partial interest in the value of that car.
Any property that can be characterized as part marital, will be subject to NC Equitable Distribution laws up until the final judgment of divorce. Hopefully I answered your questions completely. Good luck.
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