Huge question?!?
 

Hey guys,
I'm working on a project aboutif it makes sense as a German to import a used Porsche back to Germany but I have stumbled upon some roadblocks!!! Firstly, are the emssision and euro spec different for older models? One of the Porsches I'm looking at is a 1977 Porsche Targa S. The other two are much newer being a 1999 Carrera and a 2006 Carrera 4 S. I need to know what would need to be changed and how costly that would be?
Thanks a lot!!!