Here are a videos of the 2011 BMW 550i with exhaust bypass valve install where we can hear the difference in sound. Enjoy!
[youtube]http://www.youtube.com/watch?v=4lz-u_hnVrM&feature=player_embedded[/youtube] [youtube]http://www.youtube.com/watch?v=QdxoI0pvp70&feature=player_embedded[/youtube]Check Also
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