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      05-01-2019, 03:13 PM   #25
Josh/AWE
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Drives: F80 M3 Comp
Join Date: Feb 2015
Location: Horsham, PA

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Quote:
Originally Posted by windtendo View Post
Without getting redirected to a muffler, those valves will do absolutely nothing.
Incorrect, my friend. When the valve is closed, the exhaust gas is directed through the smaller diameter tubing. That reduction in tubing diameter slows down the exhaust flow reducing the volume of the exhaust.
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