Sound Deadener how thick do I need it?

I have a ’86 buick regal, im planning on putting three 12” kicker cvrs connected to a kicker 1200.1. I dont want any rattle, but i know thats hard to do. I am looking into deadoners and I have found this brand on ebay with the cheapest prices on everything. What mill do i need? Here is a link to what I am looking at.

http://cgi.ebay.com/Sound-Destroyer-80-Mil-Trunk-Kit-Car-Audio-Dynamat-Roll_W0QQitemZ300177091889QQihZ020QQcategoryZ67760QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

They also make 100mill but it cost a bit more. let me know what i should get. NO DYNAMAT too expensive i can care less about name brand stuff. I heard peel and seel comes off when it is hot. And I dont know much about liquid sound deadoner so im leaning toward this. let me know what you guys think. oh and the picture on the ebay auction is in fact the same car as mine. buick regal in the item picture FYI

IF it is as good as they claim, you will be just fine with the 80 mill. i have heard of that product before. only know 1 guy that is running it and it is great. i really love the price too!

Pioneer Premier Pro Subs with Dynamat

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