Hello together, I have a Z900 and wanted to ask you a question, do you know or are there any legal exhaust complete systems that might bring the sound over a little more satter than it can the original system? On the Internet there are some providers but how do I recognize whether the are legal? What I really don’t want is that I suddenly get the further drive in the middle of the Black Forest, then I prefer to stay with the original system with Euro 4 “Sound”. I hope you can m I’m helping! LG