Read one member’s DIY Audio upgrade for his E9x M3 admin 14 years ago One member was tired of his factory audio system and decided to redo the entire thing. Take a look. E9x M3 Audio Upgrade Share this: RelatedBMW Announces M Performance Exhaust for E9x M3February 19, 2011In "Information"The BMW M3 (E92) film. Everything about the fourth generation BMW M3January 5, 2016In "Information"Frozen Black M3 Coupe for 2011June 10, 2011In "Press Release"