That's because the tariff causes huge price increases.
Many diplomats, when they are stationed abroad, will get a corvette or american musclecar and bring it with them as thier daily driver car free of tariff.
Then they sell it for big profit and buy a car abroad that is desirable in america because it was never imported and make money on the return trip home.
Camaros, mustangs, corvettes, lincoln town cars, and the big cadillacs are the most popular choices to take abroad.