Today we put....
#5
#8
Perhaps Stelerz is referring to Dynamat. This is an expensive but very good padding that goes in the door cavity, or between the door panals and the door structure. It keeps out roadnoise and helps the speakers by improving the sound. People also use it in their trunks and under the hood to help silence their cars. Best place I found to get it is on Amazon.com.
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#10
Did you have any problems with the fit? I actually got some of these but had some issues with the install. The adapter ring didn't really seem to fit either and made them stick out too far. How do yours look?