You must have permission from DOTARS to import THAT vehicle. So don't just go overseas with the idea of finding a vehicle and shipping it. You need to have found the vehicle and submitted its details and numbers to DOTARS.
Above all, don't try to scam Customs with false valuations and/or invoices. They are well informed and have access to an enormous data base of valuations. They will seize your vehicle if they suspect you are trying it on.
You then have the option of paying up and shutting up, and maybe be charged with attempting to defraud the Government. If not, then the vehicle will eventually be sent to auction where you may be able to buy it back, thereby paying for it twice and probably still face charges.
I know a guy who had this last happen to him over a Jaguar E-type V12 coupe where he had the car dealer in London produce a false bill of sale and invoice showing a greatly reduced amount. He was a public servant who got a good dose of loose bowels when he realised he may get a criminal conviction and be sacked without entitlements (20 years superannuation for starters). In this case Customs did not prosecute, telling him the financial loss should be a lesson.

