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Great pictures on this post -- thanks. I used a plastic "zip tie" to basically do the same thing. But I like your metal clip idea better.
Have done the zip tie on my last 2 cars. 335i and now 435i. Exhaust note does sound slightly better with that 2nd butterfly valve is open all the time.
You're right...takes 3 minutes max.
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Current: 2016 435i Coupe
Previous: 2014 335i Sedan; 2013 328i Cv, 2011 335i Sedan 
Gone But Not Forgotten: 2008 135i Convertible (my favorite) 
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