I've seena few people on here mention it... some kind of noise reduction foam they put in or on the doors to minimize road noise/speaker vibration, anyone know what I'm talking about, if so, prices and installation? Does it have to be professionally installed?

Thnx in advance

 

Dynamat is one, it is pretty expensive.

 

Talk to maximadave here on the forum... He can get you a great deal on Dynamat and stereo equipment. He works at Tweeter. He sold me some Dynamat and it is awesome. I did all the doors plus the trunk and sounds much better. Now all i need is the floor and the roof.

 

As you'll notice in the Audio forum, there's many less expensive alternatives to Dynamat that are/do the same thing. I believe there's generic rubberized asphault rolls (Dynamat original) available in auto parts catalogs, etc. too.