I have to remember that you are new, haha I don't have an Eisenmann it is on my future mod list. (lots of users have future mods in their signature) Plus, if you want to hear the exhaust, there is a whole sticky about it here
http://www.e90post.com/forums/showthread.php?t=10687
Search is a GREAT feature in e90post! You should try it! Welcome by the way!