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640s don't have that vacuum thingie so they will stay shut. I don't see how would that create any problems as they are shut in comfort on 650 and M6. You should be able to cut those zip ties yourself.
Once I install this setup (STILL dragging my feet on the lower bumper setup), I will probably install a mechanism to electronically open and close the valves, as I don't think I will be able to live with droning on a daily basis.
Bolt on? I will measure mine once I get home.
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