Sound deadening materials for a car can be purchased at motoring stores. There are a variety of brands and materials available. Some can be purchased direct from manufacturer. eBay has a variety of options available.
No sound.
You can learn more about sound deadening material online at http://www.sounddeadenershowdown.com/. You might also consider checking out http://www.secondskinaudio.com/.
Most noise control used in vehicles today consist sound deadening spray or sound deadening mats. The spray or mats are applied directly to the metal, underneath the floor mats and inside the door panels.
Sound deadening like fatmat, or dynamat
sound deadening, insulation, furniture feet felt is soft and filled with air so it doesn't scratch surfaces and limits heat/cold transfer and reduces sound transmission
are you sure they are both cats. some exhaust systems have a resonator after the catylitic converter to help with sound deadening
Yes, It will block outside noises and make the stereo sound better, only time you should not, is when you are building a car to drag race with, becuase weight slows you down.
The only reason that I have heard of for insulating interior walls was for sound deadening efforts. There is no heat gain or loss advantage to insulating interior walls.
The Deadening - 2009 was released on: USA: 15 November 2009 (Lone Star International Film Festival)
The Deadening - 2007 II was released on: USA: 2007 (Santa Monica International Film Festival) USA: 2007 (FEARnet)
There is super absorbent cotton batting for soundproofing. Take it to the next level, a material called 'mass loaded vinyl' and is used in many professional settings. It's a flexible noise barrier meant to control airborne sound.
The OU pair has an AW sound, which is called a caret O sound because it has the same sound as OR in British English. Unlike the long O/R, it is not considered a long sound in US English.