Almost everything was right here. In what region do you move when you are in Germany? some inspectors are easier to handle than others. There are lost of local groups and a very helful community called dsmworld.net. some of them speak english.
In Germany there is a test called "Hauptuntersuchung" (major inspection). Everything on your car will be checked, like the complete suspension (shocks, brakes wheel hub play), wheels and tires (minimum tire tread depth is 1.6mm, but 2.6mm are recommend), lighting, leaks, visual inspection and emission inspection. The emission inspection is not as hard as in the US. It's easy to pass even with a high flow cat converter. but that requires a stock fuel management. Main reasons to fail the emission inspection are too high or too low CO² and O² values. There's no NOx test, so EGR-deletes are no problem.
bodykits out of the US&A are a huge problem. The inspectors don't have any quality report so nobody knows if they break righ around the corner. Actually every part without a quality report ("Gutachten", "ABE") has to be checked detailed before it is allowed to drive around with it. unfortunately DSMs (especially Turbos) are rare here so there aren't any reports. if you find the right inspectors you can get special permits
PS: I hope your car isn't too loud. The cops will pull out every car that looks sporty and loud. You'll might be lucky for not speaking german, haha. Germans suck at foreign languages.
