I plan on doing a complete audio upgrade and i was wondering if its necessary to dynamat all the plastics behind the seats and trunk area.

I already plan on dynamating the metal in the car but just wondered if the plastics was little over kill, but i dont want no rattle at all.

thanks for the help

 

No reason to dynamat plastic.

 

Correct.
Adding some other types of lower frequency insulation like foam, carpet and insulation is a much better way to reduce plastic/plastic and plastic/metal rattle. Plus, carpet trim pieces are much cheaper than sound deadening and they will actually work.

 

Well I went throght it and dynamated the doors back and its a BIG difference. Sound is great and cut out little of the road noise. Very happy