Eleven cars with no official documents have been seized in Bago Region from July 13-24, according to the anti-smuggling team.
The team inspected the cars near Nyaunglebin Township travelling to Yangon from Myawaddy and found they lacked licences.
The Toyotas, Hondas, Mitsubishis, Hondas, Nissans and Isuzus have been confiscated.
Customs officers claimed no import tax had been paid on the vehicles.
The authorities say cars are imported illegally from Thailand and China almost every month.
In June, nine vehicles were confiscated at the Myawaddy gate.