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Old 04-07-2014   #5
XfireZ51
 
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,685
Default Re: Dynomax VT mufflers

DM VTs have an internal flapper w no ability to control it. Here's an example of the problem I thought it would have. Its sort of like the flapper on a diesel truck.

http://youtu.be/nj3q7kCjZQY
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