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I have the GTS and it does not have valves. It does get loud during cold start.
My work is next to downtown..let me know if you want to come by.
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Current: 2014 M6GC CP and 2015 M3
Past: 2013 M5, 2012 E63, 2011 panamera turbo, 2010 E63, 2010 GTR, 2009 C63, 2008 M5
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