the motorcycle? ask for the duty.
you have a Polish export mark and have the appropriate insurance, including the necessary papers and the customs declaration. if you have in cross exceeded in the dispatch within eu, they tell you the road traffic office.
then you have time to apply for you within the validity time of the mark's export at the German tüv a type approval for and show off the vehicle. the vehicle must meet the German pretended otherwise it is not allowed.
called the way "gray import".
You can already buy Poland, but with the transportation it will be difficult.
You may not purchase poles. Slavery is forbidden !.