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i agree with not bothering with dynamat because of the expense , but realisticly foam will not stop rattles . it will do a very good job of lowering road noise , but is just not that great for rattles . i have personally used dynamat extreme and although it is very good it costs way too much . there are other deadening mats like raammat , edead , brownbread that cost a fraction of the price of dynamat extreme and are just as good . ive used raammat and it is very , very good . i got it for $70 + shipping for 62 sq. ft . which if you were to go buy that much dynamat extreme it would cost upwards of $300 . with that many sq. feet i did my trunk , two front doors and various other parts in my civic . i would deffinitly do your hole trunk , but really its up to you . if you are concerned about road noise then foam would be the way to go . either way i highly recommend raammat . the guy who sells it , rick , is a very good guy to do buisness with and if you are interested the sites name is raamaudio.com .
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