I'm in Minneapolis but do not have an aftermarket exhaust. You should come to Cars and Cafe on the first Saturday of every month. There are 350+ cars there monthly. You will see plenty of M3's there. Here is some info:
Please mark your calendars with the following 2010 dates:
May 1st
June 5th
July 3rd
August 7th
September 4th
October 2nd
November 5th
HD Videos from previous events (Thanks to Matt Desmond!):
Photo from Last Year (Thanks to Alex Bellus):
April:
http://picasaweb.google.com/bellus.alex/CarsCafe4409#
May:
http://picasaweb.google.com/bellus.alex/CarsCafe5209#
June:
http://picasaweb.google.com/bellus.alex/CarsCafe6609#
July:
http://picasaweb.google.com/bellus.alex/CarsCafe7409#
August:
http://picasaweb.google.com/bellus.a...PSDynoDay8109#
September:
http://picasaweb.google.com/bellus.alex/CarsCafe9509#
October:
http://picasaweb.google.com/bellus.alex/CarsCafe10309#
November:
http://picasaweb.google.com/bellus.alex/CarsCafe11709#