Law / Buying a car in Poland or Germany? [36]

Hello, Everyone, i am (Sahand), it is great to get a nice advice from you guys.

My case simply I have Dodge Charger 2015 6V RWD, With Boral Exhaust System, Lovely Nice Sound Car, I want to transport it to Warsaw, but i am really confused, that i should sell it in Dubai, and Buy Near Value Car in Warsaw, or get the car, the tax and the procedure it looks like a headache, but at the same time i really like car, also i am confused because of the fuel consumption, which is almost 15.4L/100KM.

Do you recommend any trustable website in Poland to search for clean 2nd hand cars?

Thanks & would appreciate your kind replies.