I have had my 2011 550i for 6 months and the only improvement I would like to make to this fabulous machine is to upgrade the exhaust system so it sounds as good as it performs. My first thought is to upgrade to a M5 exhaust system. Any advice and experience out there? Thanks, Steve
Tryi Eisnemann - custom Tryi Eisnemann - custom ordered and handmade in Germany. http://www.youtube.com/watch?v=x_yhTSUMlKw They make two versions: Sport which is 10% louder than stock and Race which is about 30%-40% louder. Check out http://www.ind-distribution.com/ Hope this helps.
