The custody duty was nearly Rs. 60 million for the car, which has a 5,000 cubic cm engine capacity and a speed of up to 350 kmph.
The woman, Jihan Hameed, also contested from Colombo on the UPFA ticket during the Rajapaksa regime.
Namal had supported her in her election campaign.
Her husband, Risard Hameed, is a vehicle importer.
Jihan has her own business, Bavarian Motors Pvt. Ltd. of no. 118, Isipathana Mawatha, Colombo 05.