U.S. Import Harley Davidson Road King 2008 from USA – what technical changes are necessary?

Hello together, some have already been written and posted. I also bought a H.D. Road King 2008 in the USA in the “Harley-Rausch”. a) Which modifications are necessary in order to get the road registration / TÜV? b) with what understandable costs is to be reckoned with? c) Who has possibly successfully imported the same model (2008 – Road King, injector) already? I am grateful for every correct answer. A real H.D. Greenhorn