Well, it doesn't take much to infer the racing part anyhow. It's not ideal to put your car in front of a trailer that says "Hardcore Racing" when trying to sell a car that's "never been raced".
The car sported the same windshield banner while being repaired at SSV.
Good point about the racing trailer...Although it could have just been used for transporting the GT in non-race related events.
If the facts are what they appear to be at this point and the involved parties have actual or implied knowledge: perhaps potential theft by fraudulent misrepresentation and failure to disclose, for starters, depending on what occurs and how/whether it is charged.
Personally, I'd be wary of buying a car being sold or marketed by someone other than the owner, for starters, in a private party transaction. Not sure which law will govern the ultimate transaction, but here is an excerpt from CA law, for educational purposes only:
CA PENAL CODE 484. (a) Every person who shall feloniously steal, take, carry,
lead, or drive away the personal property of another, or who shall
fraudulently appropriate property which has been entrusted to him or
her, or who shall knowingly and designedly, by any false or
fraudulent representation or pretense, defraud any other person of
money, labor or real or personal property, or who causes or procures
others to report falsely of his or her wealth or mercantile character
and by thus imposing upon any person, obtains credit and thereby
fraudulently gets or obtains possession of money, or property or
obtains the labor or service of another, is guilty of theft. In
determining the value of the property obtained, for the purposes of
this section, the reasonable and fair market value shall be the test,
and in determining the value of services received the contract price
shall be the test. If there be no contract price, the reasonable
and going wage for the service rendered shall govern. For the
purposes of this section, any false or fraudulent representation or
pretense made shall be treated as continuing, so as to cover any
money, property or service received as a result thereof, and the
complaint, information or indictment may charge that the crime was
committed on any date during the particular period in question.